These surface from time to time but are rare. I don't know that the gunsmith has ever been identified. They do have a strange and unique appearance.

Some have the front half of the cyl split lengthwise with the right half fixed in the cyl window and the left half mounted on the yoke, rotating out to the side with the back half of the cyl when opened. They look like they have a standard cyl when closed.

Most likely used for NRA Bullseye matches. A 22 RF, any CF cartridge and 45 ACP firearms were required for the matches. Many used the 45 target models or a 1911 for both the CF and 45 firearm.

I used a S&W M41 and a Colt 1911 Gold Cup when I shot the matches.

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Jim
S&WCA #819