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In 1923 Ordnance ordered 10,000 "Improved Model 1911" pistols which were delivered in 1924. In 1926 Ordnance decided the model designation would be Model 1911A1, so this in effect put the last Model 1911 pistols being manufactured in early 1919. After the 1924 order of 10,000 pistols, no more were ordered until 1937.

If you are searching for a Government Model, which was the commercial version of the military pistol, try using that instead of the 1911 designation.
 

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Don't know about the early Colt historical letters, but the recent letters on the Government Model or 1911/1911A1 pistols the caliber is listed as .45/c. On the New Service pistol if the caliber is .45 Colt, it too is listed as ​.45/c.
 

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.45 Auto Rim was a commercial answer to revolvers originally chambered in .45 ACP rather than a stand alone caliber.

The same assumption does not carry over into the .38 caliber pistols. For one, the Super .38 caliber is listed as .38 Super rather than .38/c.
 
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