Infallible Single triggers were patented by A H Worrest of Lancaster PA. On a quick look I have patents: # 829453 Aug 28, 1906; # 871550 Nov 19, 1907; # 1013254 Jan 2, 1912 & #'s 1029781 & 1029782, both June 18, 1912.
I have an H grade Lefever fitted with an Infallible SST bearing the two 1912 patent dates. This gun has two SN's stamped on it, both in the 73,xxx range, a very high number for a Lefever. It is a twist bbl'd gun but has uncapped round knob grip & the forend has neiter metal tip nor escutcheon in the "Belly". Both of these are mostly found on the DS grade, though all else is correct for an H, including cocking indicators & doll's head rib extension.
I cannot prove it but highly suspect it was a putting together of parts on hand at the Ithaca plant, cleaning up parts, or perhaps a "Lunchbox Special". I have been told that Ithaca offered Infallible triggers during this era, but have no proof of this either.
