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Legacy Member
Union Switch 1911A1
Can someone shed some light on the USS 1911A1's with P proof on the slides vs. those without? I have seen slides without the p and the frames with the P and vise versa.
Is there a correlation between the P on the slide and the serial numbers?
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01-31-2010 08:50 PM
# ADS
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The early US&S pistols that have no P proof mark on the frame should not have a P mark on the slide either, to be correct. In the mid serial number range, they began putting the P proof mark on the side of the frame and also on the top of the slide just forward of the rear sight. The P will be on the very edge of the top of the slide. In the later serial number range, they still had the P on the frame and the slide P proof was moved to the center on the slide, still just forward of the rear sight.
You should have a copy of Clawson's Collector's Guide to Colt .45 Service Pistols. It explains all you need to know about the pistols in question. You can go to http://www.coolgunsite.com and order a copy for $40.00
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