Just punched that into Yahoo and found someone's response to same question elsewhere:


Bridge Gun Co never made guns FOR anyone. Guns marked with this trade name were made for Shapleigh Hardware of St Louis by various arms makers. Shapleigh probably ordered each batch from whomever offered the lowest price since Bridge guns made by Harrington and Richardson have been ID from the same time period as the Stevens guns. Apparently the earliest were purchased through H&D Folsom, a large distributer in New York, and were made by Folsom's subsidiary, Crescent Firearms of Norwich, CT, and several Belgian manufacturers, as early as the 1880's.

Don't know how true this is, but it's something!