Quite possible that the Officers was required to furnish their service revolvers within certain guidelines.
I started in 1962 and was required to furnish my own service revolver which had to be:
1. not less than 38 caliber
2. six shot
3. barrel no less than 4" or more than 6".
4. manufacture smith and wesson or colt
finish could be blue or nickel
holster, belt, and accessories black color-plain, basketweave, or carved with bright metal hardware.