Union Switch & Signal produced some of the most collectible WWII M1911A1 pistols. US&S pistols are known for limited production and strong collector interest.
US&S produced far fewer pistols than Colt or Remington Rand.
Correct US&S examples are highly desirable among WWII collectors.
Review markings, finish, parts, and service-history indicators together.
| Year | Serial Start | Serial End | Notes |
|---|
| Production Period | Serial Context | Expected Inspection / Acceptance | Expected Finish & Markings | Extra Collector Checks |
|---|---|---|---|---|
| Early US&S Production | Early Union Switch & Signal wartime production | F.J.A. inspection initials should be reviewed together with ordnance stamp and frame markings. | US&S slide markings, frame markings, and parkerized finish should match the production period. | Review slide type, barrel markings, grips, hammer, mainspring housing, and overall finish consistency. |
| Main Wartime Production | Primary US&S contract production | F.J.A. inspection context should remain consistent with the wartime production range. | Correct US&S slide markings and parkerized finish should be reviewed across slide, frame, and small parts. | Check ordnance stamp clarity, barrel type, slide variation, magazine type, and wear consistency. |
| Late Production Examples | Later US&S wartime production | Inspection markings should remain consistent with documented US&S wartime production. | Late production finish and markings should appear consistent across the pistol. | Review for replacement barrels, mixed parts, arsenal rebuild marks, and finish mismatch from service history. |
| Service-Processed US&S Pistols | Any US&S serial range | Original inspection marks may still remain after arsenal rebuild or depot repair. | Finish and parts may differ from original factory configuration if the pistol was rebuilt during service. | Document AA, SA, RIA, OG, ANAD, LEAD, or other depot markings when present. |
| Feature | Collector Notes |
|---|---|
| Inspector Mark | F.J.A. inspection initials should match the production range and overall pistol condition. |
| Finish | Generally parkerized; finish consistency across slide and frame should be reviewed carefully. |
| Slide Markings | US&S slide markings should match documented wartime production examples. |
| Ordnance Stamp | Crossed cannons stamp should be reviewed together with finish and frame condition. |
| Rebuild Marks | Arsenal rebuild marks may indicate legitimate military service history. |