Evidence
11 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-11).
-
[1]NHHC DANFS, consolidated entry 'SC-501 - SC-600' (live page verified 2026-10-03) [nhhc_danfs]
- Locator
- SC-501-SC-600 consolidated page, SC-533 block
- Finding type
- vessel_history
- Finding
- DANFS consolidated entry for this hull: 'Built at Luders Marine Const. Co., Stamford, Conn. Keel laid 5/5/41. Launched 4/13/42. Commissioned 6/12/42. Transferred to France 10/2/44.' DANFS styles the hull SC-533 throughout and does not mention the PC-533 commissioning designation.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1944
- Population
- Luders Marine construction trades (1941-42); U.S. Navy crew (1942-44)
- Limitations
- Authoritative Navy history office record for construction milestones and transfer date; contains no asbestos, material, or equipment content and no post-transfer French history. The DANFS block format omits the brief PC-533 designation - the designation sequence is documented in ev-02/ev-03.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-533-sc533-01
-
[2]NavSource Online: Submarine Chaser Photo Archive, SC-533 ex-PC-533 (page 12/150533) - timeline, spec block, call sign [other_primary]
- Locator
- NavSource 12/150533.htm header block, specifications block
- Finding type
- vessel_history
- Finding
- NavSource timeline for this hull: laid down 5 May 1941 by Luders Marine Construction Co., Stamford, CT; launched 13 April 1942; 'Commissioned USS PC-533, 12 June 1942'; 'Reclassified SP-533 in April 1943'; 'Transferred to France 2 October 1944 and reclassified CH-104'; fate unknown; call sign Nan-Able-Uncle-Victor; page notes 'There is no DANFS history available for SC-533' (superseded - the consolidated NHHC DANFS SC-501-600 page now exists, ev-01). Spec block: displacement 148 t.; length 110'10"; beam 17'; draft 6'6"; speed 15.6 kts.; complement 28; armament one 40mm mount, two .50 cal. machine guns, two depth charge projector 'Y Guns,' two depth charge tracks; propulsion two 880bhp General Motors 8-268A diesel engines, Snow and Knobstedt single reduction gear, two shafts.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1961
- Population
- Luders Marine construction trades (1941-42); U.S. Navy crew (1942-44); French crew (1944-61)
- Limitations
- NavSource is a volunteer secondary compilation - milestone dates track official records and agree with DANFS here. 'SP-533' is a typographical error: the page title ('SC-533 ex-PC-533'), all sister-hull pages, Navypedia, and jounin.jp show the April 1943 designation as SC-533 (see ev-03). Page contains no asbestos content. Specs conflict slightly with class references (ww2pcsa gives 98 t displacement, 3"/23 main gun) - era of the boat fits either block; not material to asbestos status.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-533-sc533-02
-
[3]Designation cross-check: NavSource SC-497 page (commissioned USS PC-497, reclassified SC-497 April 1943) and SC-532 page (commissioned USS PC-532, reclassified SC-532 April 1943); NavSource SC-533 page ('SP-533' April 1943); Navypedia US SC list ('PC533, 9.1942- SC533') and French CH list ('Ch104 (ex-SC533, ex-PC533)'); jounin.jp PC/SC compilation (1943/4 reclassified submarine chaser SC-533) [other_primary]
- Locator
- NavSource 12/150497.htm, 12/150532.htm, 12/150533.htm; navypedia.org/ships/usa/us_sc_sc.htm and /ships/france/fr_es_sc.htm; uswarships.jounin.jp PC-497_1 page
- Finding type
- historical_record
- Finding
- DESIGNATION HISTORY: this hull commissioned carrying the designation PC-533 (NavSource) - consistent with the class-lead and sister-hull pattern (PC-497->SC-497, PC-532->SC-532, April 1943) and with Navypedia's 'ex-PC533' notation. She was never a PC-461-class patrol craft: the WWII patrol-craft number series was shared across five small-craft types, and the 110-foot wooden SC-497-class boats that commissioned under PC designations were submarine chasers in construction and armament throughout. The 'SP-533' printed on the NavSource SC-533 page is a typo - SP (section patrol) does not fit a purpose-built subchaser, and every parallel source gives SC-533 for the April 1943 reclassification.
- Verification
- partial
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1943 (designation window)
- Limitations
- Corrects/clarifies a designation sequence, not a material or exposure claim. The April 1943 reclassification date rests on NavSource sister pages and jounin.jp; Navypedia prints '9.1942' for the PC->SC change - unresolved (see gaps). The shipbuildinghistory type table already files her under 'SC 533'.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-533-sc533-03
-
[4]Navy and Marine Corps Awards Manual, NAVPERS 15,790 (1953), Part IV - List of Authorized Operations and Engagements and List of Ships and Units Eligible for Engagement Stars (HyperWar/ibiblio transcription of the official manual) [other_primary]
- Locator
- Awards Manual Part IV, Section 2-16, European-African-Middle Eastern engagements list, 'SC 533:' entry (E2, E3, E4-1, E7)
- Finding type
- vessel_history
- Finding
- The official awards manual credits SC 533 with four engagement-star operations in the European-African-Middle Eastern area: E2 Sicilian occupation, 9-18 July 1943; E3 Salerno landings, 9-21 September 1943; E4-1 Anzio-Nettuno advanced landings, 30 January - 17 February 1944; E7 Invasion of Southern France, 15 August - 25 September 1944. Her transfer to France (2 October 1944) falls within a week of the E7 window closing - the hull was handed over in theater.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1943-1944
- Population
- U.S. Navy crew, Mediterranean operations 1943-44
- Limitations
- Documents theater participation windows, not actions performed - star eligibility does not detail the vessel's role within each operation. No asbestos content. The engagement windows prove the hull operated in the Mediterranean combat zone mid-1943 through September 1944; they establish crew presence, not exposure.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-533-sc533-04
-
[5]uboat.net Allied Warships, USS SC-533 (SC-533) entry - build milestones, wartime commanding officers, notable event [other_primary]
- Locator
- uboat.net warship entry 8836 - specifications table, commands table, 'Notable events' section
- Finding type
- vessel_history
- Finding
- uboat.net records for this hull: ordered 1 April 1941; built by Luders Marine Construction Co., Stamford, CT; laid down 5 May 1941; launched 13 April 1942; commissioned 12 June 1942; end service 2 October 1944; 'Transferred to France on 2 October 1944 being renamed CH-104.' Commanding officers: Drayton N. Hamilton, USNR (12 Jun 1942 - early 1943); Lt.(jg) Charles P. Blackledge, USNR (early 1943 - early 1944); C. H. Sperry, USNR (early 1944 - 2 Oct 1944). Notable event: 13 August 1942, USS SC-533 picked up 24 survivors of the Dutch merchant Medea, torpedoed and sunk earlier that day by U-658 about 15 miles southwest of Cape Maysi at 19-54'N, 74-16'W.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1944
- Population
- U.S. Navy crew (1942-44); 24 rescued Dutch merchant mariners (Aug 1942)
- Limitations
- Curated secondary database with referenced sourcing - consistent with DANFS/NavSource on every overlapping milestone. Documents a Caribbean rescue event under the PC designation and the CO roster. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-533-sc533-05
-
[6]postenavalemilitaire.com (French naval postal-history forum, vessel fiche) CH-104 (1944/1961); corroborated by shipbuildinghistory.com Luders yard table ('To France 1944 as Ch. 104, later P 693, Q 300, condemned 1961') and Navypedia French CH-class list [other_primary]
- Locator
- postenavalemilitaire.com t5801 fiche CH-104 (HISTORIQUE/CARACTERISTIQUES blocks); shipbuildinghistory.com/shipyards/yachtsmall/luders.htm SC 533 row; navypedia.org/ships/france/fr_es_sc.htm Ch104 row
- Finding type
- vessel_history
- Finding
- French-service record for this hull: transferred to France October 1944 as chasseur de sous-marins CH-104 (mis en service 02 octobre 1944); renamed CH-693, then P-693 on conversion to vedette de servitude (service boat); desarme (paid off) 13 May 1961. shipbuildinghistory's Luders yard table adds a further pennant 'Q 300' and 'condemned 1961'. Navypedia's French CH list shows 'Ch104 (ex-SC533, ex-PC533), 1950- Ch693, 1950- P693' but dates striking '1950/54' - the 1961 end date is carried by the two more specific sources.
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1944-1961
- Population
- Free French Naval Forces / French Navy crew (1944-61)
- Limitations
- postenavalemilitaire is a collector/historian forum - detailed French-service data without cited primary documents; shipbuildinghistory is a compiled secondary source built from official records. The two agree on the 1961 end date; Navypedia's 'stricken 1950/54' conflicts (see gaps). French operations, homeports, and disposal details after condemnation are undocumented in located sources. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-533-sc533-06
-
[7]Patrol Craft Sailors Association, 'Information on WWII SCs' - 110-foot wood-hull subchaser specifications and program totals [other_primary]
- Locator
- ww2pcsa.org/subchaser.html - spec table and program/lend-lease tallies
- Finding type
- historical_record
- Finding
- Class-level data: the 110-foot wood-hull SC type displaced 98 tons, 110'10" x 17'11.5", complement 3 officers + 25 enlisted; 475 ordered, 438 delivered at ~$500,000 each; 142 transferred under Lend-Lease including 50 to France. This hull is one of the 50 French transfers (CH-104).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1941-1945
- Population
- SC-497 class crews and builders (1941-44)
- Limitations
- Veterans' association compilation - class context only; spec figures differ in detail from NavSource's per-hull block (148 t vs 98 t displacement; 40mm vs 3"/23 armament) reflecting wartime fit changes - both left as stated. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-533-sc533-07
-
[8]Era inference built on: NavSource spec block for this hull (two GM 8-268A diesels, single-reduction gear, two shafts - diesel plant, no steam); ww2pcsa class specs (110-foot wood hull); SC-497-class construction program at yacht/boat yards 1941-44 [other_primary]
- Locator
- NavSource 12/150533.htm specifications block; ww2pcsa.org/subchaser.html
- Finding type
- asbestos_application
- Finding
- A 110-foot wooden submarine chaser built 1941-42 at a yacht yard, powered by two General Motors 8-268A diesel engines, sits inside the Navy's documented wartime asbestos-use era but carries a materially smaller asbestos footprint than a steam vessel: there is no boiler, steam line, or turbine aboard. Era-standard asbestos-relevant applications for a diesel patrol craft of this type and period were engine-exhaust and muffler lagging, machinery gaskets and packing, and electrical insulation.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1941-1961
- Population
- Luders Marine construction trades (1941-42); U.S. Navy crew (1942-44); French Navy crew (1944-61)
- Limitations
- Class/era inference only - no hull-specific insulation list, material survey, work package, or class-level asbestos documentation was located for the SC-497 type. Names era-standard applications, not confirmed installed materials; no quantity. Wooden hull construction eliminates several major steam-era pathways; the inference is deliberately narrow.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-533-sc533-08
-
[9]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) [gao]
- Locator
- GAO product page HRD-80-2 (full text blocked, HTTP 403)
- Finding type
- gov_survey
- Finding
- GAO documented that the Navy used asbestos insulation extensively aboard ships and did not begin substituting alternative insulation materials until the early 1970s - spanning this hull's construction (1941-42) and U.S. service era (1942-44).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1979
- Population
- Navy shipyard workers; asbestos program review
- Limitations
- Program-level documentation; supports era context only, not any fact specific to this hull - HRD-80-2's fieldwork concerned steam-era Navy shipyards, and a wooden diesel subchaser's exposure profile differs from the yards' principal cases. Full text not retrieved (gao.gov returns HTTP 403 to automated fetch, confirmed 2026-10-03) - content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-533-sc533-09
-
[10]Batch-7908 search ledger (this record): NHHC DANFS consolidated SC-501-600 entry; NavSource 12/150533 and sister pages; uboat.net 8836; NAVPERS 15,790 awards list (HyperWar); shipbuildinghistory PC/SC table and Luders yard table; Navypedia US/FR lists; postenavalemilitaire CH-104 fiche; ww2pcsa class page; NVR (no entry); GAO HRD-80-2 (blocked); NARA catalog (JS-rendered); CourtListener (partially run - see ledger) [other_primary]
- Locator
- search_ledger rows sl-uss-sc-533-sc533-01 through -16
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or litigation naming SC-533 / PC-533 / CH-104 was found in the public sources searched (see search_ledger). The hull spent 1944-61 in French service and was condemned in France - no U.S. post-war disposal record exists for her.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 2026-10-03
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard - era-consistent inference supports some asbestos materials in the machinery space, at low quantity relative to steam vessels. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-533-sc533-10
-
[11]Archival leads not yet executed: NARA RG 24 deck logs for PC-533/SC-533 (June 1942 - October 1944, Mediterranean service period); Bureau of Ships/RG 19 photo holdings for this hull; Luders Marine Construction yard records (reported lost in a 1962 shipyard fire - New York Times, 9 Jul 1995, 'A Shipyard Legend Named Luders'); French naval archives (Service historique de la Defense) for CH-104/CH-693/P-693/Q-300 service 1944-61 [other_primary]
- Locator
- catalog.archives.gov (JS-rendered); nytimes.com/1995/07/09/nyregion/a-shipyard-legend-named-luders.html (HTTP 403)
- Finding type
- historical_record
- Finding
- The likeliest remaining ship-specific record sets are undigitized: U.S. deck logs for the 1942-44 period and any Bureau of Ships work/delivery papers naming the hull; on the French side, Service historique de la Defense holds the vessel's post-transfer file. Builder primary records are probably unrecoverable - the NYT reports Luders Marine's records were lost in a 1962 yard fire.
- Verification
- partial
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1961
- Limitations
- Leads only - none of these holdings was searched this session. NARA catalog is JS-rendered and could not be verified (catalog.archives.gov, confirmed 2026-10-03). The NYT article is blocked to automated fetch (HTTP 403); the 1962-fire detail is snippet-verified only and should be re-confirmed before reliance.
- Atlas source
- true
- Evidence ID
- ev-uss-sc-533-sc533-11