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- Blank stamp Springfield Armory
- AMP Stamp All Metal Products Co. (hard to read)
- ACE 2 Stamp Aggressive Engineering Corporation (Military production)
- AEC 2 Stamp Aggressive Engineering Corporation (Commercial production)
- AEC 3 - Aggressive Engineering Corp (Commercial)
Anaheim, CA
- AGE 1 - Aggressive Engineering Corp (Millitary contract)
Anaheim, CA
- AGE 2 - Aggressive Engineering Corp (Millitary contract)
Anaheim, CA
- AMP 1 - All Metal Products Wyandotte, MI
- BLM - Barry L Miller Eng Inc Irvine, CA
- BRW 1 Stamp Borg-Warner Spring Division
- BRW 2 Stamp Borg-Warner Spring Division
- BRW 3 Stamp Borg-Warner Spring Division
- BRW 4 Stamp Borg-Warner Spring Division
- BRW 5 Stamp Borg-Warner Spring Division
- BRW 6 Stamp Borg-Warner Spring Division
- BRW 7 Stamp Borg-Warner Spring Division
- B-W 4 - Borg Warner (WW2) Spring Division,Bellwood, IL
- C - Lerio Patent Cup Co. Mobile, AL
- DAQ Stamp Dominion Arsenal (Quebec)
- fF - Fedders Mfg Buffalo, NY
- HA - Haerens Ammunitions Arsenal Copenhagen, Denmark
- IMI Stamp Israeli Military Industries (Israel)
- I S 1 Stamp International Silver Company
- I S 2 Stamp International Silver Company
- I S 3 Stamp International Silver Company
- IS 4 - International Silver Meriden, CT
- IS 5 - International Silver Meriden, CT
- JMO Julios Maurer, Oberstein Germany
- 58 - Nationalist China
- 59 Nationalist China
- 68 JMO Stamp Julius Maurer (Germany)
- 69 JMO Stamp Julius Maurer (Germany)
- 70 JMO Stamp Julius Maurer (Germany)
- 71 JMO Stamp Julius Maurer (Germany)
- 72 JMO Stamp Julius Maurer (Germany)
- 74 JMO - Julius Maurer Oberstein, Germany
- LP 1956 Stamp Italian (name unknown)
- L&H 81 Italian or Danish
- LP 1961 Stamp Italian (name unknown)
- NW Stamp Northwest Metal Products
- MAS Manufacture D' Armes St. Etienne France
- MBZ Stamp (fat letters) Mourek & Ball, Zeist (Netherlands)
- MBZ Stamp (small letters) Mourek & Ball, Zeist (Netherlands)
- MBZ Stamp (regular letters) Mourek & Ball, Zeist (Netherlands)
- MFT Mataal Fabriek Tilburg Netherlands
- NW - Northwest Metal Seattle, WA
- SF Serini France
- S - Stanley Works (or SW) New Britain, CT
- S A Stamp Springfield Armory
- S A Stamp with dash underneath Springfield Armory
- S A Stamp (oversized letters) Springfield Armory
- TF&S Thomas French & Co. Ltd
- W4 - R Wallace & Sons Wallingford, CT
- W5 Stamp R. Wallace and Sons
- W6 - R Wallace & Sons Wallingford, CT
- WEP Stamp Wade Electric Products
- WEP1 - Wade Electric Products Sturgis, MI
- WRA - Winchester Repeating Arms New Haven, CT
- WR Wallace & Sons Mfg.
- 5 Stamp Unknown - might be an S for Stanley Works but uncertain at this point
- 5mm hole. - Austrian
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