This factory manufactured safety thumb slide - large variation is for the American Gun Company (New York) Knickerbocker hammerless double shotgun in 12 gauge and is in very good condition exhibiting a grayish brown patina with light wear. This safety thumb slide measures 1.327 " long. (file photo)
Note: American Gun Company shotguns with the following serial numbers have been observed with this part:
12 gauge: 194426