Ithaca M1911A1 Serial Numbers

Ithaca M1911A1 Reference

Ithaca Gun Company produced U.S. military M1911A1 pistols during World War II. Ithaca identification requires special care because part of its serial range overlaps with Colt.

F.J.A. Inspector

Frank J. Atwood inspection marks are a major Ithaca verification point.

Duplicate Serial Range

Serials 856405 through 916404 overlap with Colt production.

Collector Verification

Check frame markings, slide markings, finish, ordnance stamp, and rebuild marks.

Ithaca Serial Number Ranges

Year	Serial Range	Notes
1943	856405 - 916404	Duplicate Ithaca serial range. Verify with F.J.A. inspection initials, Ithaca slide markings, frame markings, finish, and ordnance stamp.
1943	1208674 - 1279673	Ithaca WWII production
1943	1441131 - 1471430	Ithaca WWII production
1944	1743847 - 1890503	Ithaca WWII production
1945	2075104 - 2134403	Late Ithaca WWII production
1945	2619014 - 2693613	Final Ithaca WWII production

Year

Serial Range

Notes

1943

856405 - 916404

Duplicate Ithaca serial range. Verify with F.J.A. inspection initials, Ithaca slide markings, frame markings, finish, and ordnance stamp.

1943

1208674 - 1279673

Ithaca WWII production

1943

1441131 - 1471430

Ithaca WWII production

1944

1743847 - 1890503

Ithaca WWII production

1945

2075104 - 2134403

Late Ithaca WWII production

1945

2619014 - 2693613

Final Ithaca WWII production

What Should Be Seen By Serial Range

Serial Range	Expected Inspector / Acceptance	Expected Finish & Markings	Extra Collector Checks
856405 - 916404	F.J.A. should be carefully reviewed because this range overlaps with Colt.	Ithaca slide and frame markings should match Ithaca contractor production, not Colt.	Do not identify by serial alone. Compare F.J.A., slide legend, frame markings, ordnance stamp, finish, and parts.
1208674 - 1279673	F.J.A. inspection initials expected for Ithaca acceptance review.	Wartime parkerized finish should be evaluated for consistency across slide, frame, and small parts.	Check slide marking style, barrel markings, grips, mainspring housing, and any arsenal/depot marks.
1441131 - 1471430	F.J.A. inspection initials expected. Ordnance acceptance stamp should be reviewed with finish condition.	Ithaca WWII contractor markings should be present and consistent with the serial period.	Look for service replacement parts, barrel changes, finish mismatch, or rebuild indicators.
1743847 - 1890503	F.J.A. inspection initials expected for WWII Ithaca production.	Parkerized finish and Ithaca markings should be reviewed together for consistency.	Check ordnance stamp clarity, slide/frame finish match, small parts, barrel markings, and magazine type.
2075104 - 2134403	F.J.A. inspection initials expected on late Ithaca production examples.	Late-war parkerized finish should be evaluated with wear pattern and marking sharpness.	Review for late-war parts consistency, arsenal marks, barrel replacement, and mixed service parts.
2619014 - 2693613	F.J.A. inspection initials expected for final Ithaca production review.	Final-production Ithaca markings should be reviewed against finish, frame, and slide condition.	Check for postwar service history, replacement parts, depot marks, and whether the pistol remains configuration-consistent.

Serial Range

Expected Inspector / Acceptance

Expected Finish & Markings

Extra Collector Checks

856405 - 916404

F.J.A. should be carefully reviewed because this range overlaps with Colt.

Ithaca slide and frame markings should match Ithaca contractor production, not Colt.

Do not identify by serial alone. Compare F.J.A., slide legend, frame markings, ordnance stamp, finish, and parts.

1208674 - 1279673

F.J.A. inspection initials expected for Ithaca acceptance review.

Wartime parkerized finish should be evaluated for consistency across slide, frame, and small parts.

Check slide marking style, barrel markings, grips, mainspring housing, and any arsenal/depot marks.

1441131 - 1471430

F.J.A. inspection initials expected. Ordnance acceptance stamp should be reviewed with finish condition.

Ithaca WWII contractor markings should be present and consistent with the serial period.

Look for service replacement parts, barrel changes, finish mismatch, or rebuild indicators.

1743847 - 1890503

F.J.A. inspection initials expected for WWII Ithaca production.

Parkerized finish and Ithaca markings should be reviewed together for consistency.

Check ordnance stamp clarity, slide/frame finish match, small parts, barrel markings, and magazine type.

2075104 - 2134403

F.J.A. inspection initials expected on late Ithaca production examples.

Late-war parkerized finish should be evaluated with wear pattern and marking sharpness.

Review for late-war parts consistency, arsenal marks, barrel replacement, and mixed service parts.

2619014 - 2693613

F.J.A. inspection initials expected for final Ithaca production review.

Final-production Ithaca markings should be reviewed against finish, frame, and slide condition.

Check for postwar service history, replacement parts, depot marks, and whether the pistol remains configuration-consistent.

Inspector Information

Inspector Initials	Inspector Name	Notes
F.J.A.	Colonel Frank J. Atwood	Primary WWII acceptance inspector associated with Ithaca production.

Inspector Initials

Inspector Name

Notes

F.J.A.

Colonel Frank J. Atwood

Primary WWII acceptance inspector associated with Ithaca production.

Common Characteristics

Feature	Verification Notes
Finish	Generally parkerized; compare finish consistency across slide, frame, and small parts.
Inspector Mark	F.J.A. should be checked carefully, especially in the duplicate serial range.
Ordnance Stamp	Crossed cannons ordnance stamp should be reviewed with frame and finish condition.
Slide Markings	Ithaca slide markings and variations should be compared to known examples.

Feature

Verification Notes

Finish

Generally parkerized; compare finish consistency across slide, frame, and small parts.

Inspector Mark

F.J.A. should be checked carefully, especially in the duplicate serial range.

Ordnance Stamp

Crossed cannons ordnance stamp should be reviewed with frame and finish condition.

Slide Markings

Ithaca slide markings and variations should be compared to known examples.

Important Ithaca Note: Serial numbers from 856405 through 916404 were duplicated by Ithaca. To confirm authenticity, look for the F.J.A. inspection initials of Frank J. Atwood on Ithaca pistols and compare all markings together.