This diagram provides some of the commonly found markings on the Colt M1911 pistol in the serial number range of 85,000 to 450,000.
![Colt M1911 Barrel Markings Colt M1911 Barrel Markings](https://sightm1911.com/lib/history/Colt4.jpg)
This diagram provides some of the commonly found markings on the Colt M1911 pistol in the serial number range of 85,000 to 450,000.
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