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Colt Conversion Unit .22 LR-.45 ACP - Early Pre-War Service Model  Conversion Unit in Original Box - SN U56 (ca. 1938)


Gary Grace Collection

Early Pre-WWII (ca. 1938) Numbered Conversion Unit complete with original box, instructions and all accessories.  Two tone magazine with "Service Model" designation on the floorplate.  Box is earliest type that lacks center compartment for recoil spring.

Floorplate markings of the two-tone conversion unit magazine.

"U" prefix number on the top of the slide just ahead of the rear sight. 

Complete set of pre-war components.

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January 2022


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