I have a 4 digit serial # Browning that my father bought in 1932. This gun, according to my father, had two triggers when new and if you pulled the rear trigger it fired the top barrel; pulling the trigger again fired the bottom barrel. He said the trigger became confused and he returned the gun and a single selective trigger was installed. The old trigger guard was used as there is a mark on the inside of the trigger guard indicating the position of the rear trigger.
Thus such a trigger was available on early Brownings and I would assume that it was likely used on sxs guns.
jlb
Last edited by jlb; 02/29/16 08:06 PM.