Bridgeport Gun & Impliment Co. (BGI) 

Measuring only 3", this was first seen about 1881 in the BGI 1881 catalog 

Bridgeport Gun Implement Company (BGI) was founded in February of 1878 in Bridgeport Connecticut by Marcellus Hartley (1827 -1902).  BGI Manufactured gun implements such as loading tools, cleaning tools, shell extractors and powder measures for old style guns and later other sporting articles to include duck, Turkey calls, whistles  and other breech-loaders accessories.