This whole thread makes me suspect that Alfred Worrest is responsible for the Philadelphia Single Trigger ads...but Lancaster Pa, where Worrest was from, is about 70mi. from Philladelphia. The part that doesn't make sense with this theory, is #1. There is (so far) no registered design at the US Patent Office that matches the detailed pics that Researcher has posted. and #2. Worrest had already been issued patent numbers 829,453 and 871,550 by 1907 and niether look like the ad photo.
Did Worrest also have patents that were applied for but were never granted (perhaps because of Thorneley's design)? Whatever the case, this is a very interesting chapter of doublegun history in America. What year did Fox move from Baltimore to Philadelphia, 1902.? I assume the skilled human resources were already in Philadelphia when Ansley relocated there, but who? Where they old timers left from the previous generation of gunmakers in Philadelphia (muzzleloading era)? Maybe Heysinger, Skerl, Rupertus, or Clark? Was Genez from Philadelphia?
