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First of all, the term "1911" is not part of the nomenclature of a Colt Conversion Unit made to convert a Colt Model O centerfire pistol to .22 rimfire.

The primary identifying characteristic of a Pre-War Conversion Unit is the serial number on top of the slide just ahead of the rear sight. The serial number will have a "U" prefix.

(Apologies to anyone offended by my "delivery.")
 
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