Serial number on Colt slide…
Has late production mark “F” on Colt barrel…
Based on the wear and identifiable components, this has all the indications of a complete 1943 COLT slide on a complete Union Switch & Signal receiver. The shop said the seller is a regular customer (58 yo) who said his grandfather brought this back after serving in WWII. Since he lost this via pawn, it's likely a touchy subject. (I know... buy the gun, not the story.)
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