Well, Lancaster Arms Co. the manufacturer of the Infallable Single trigger was established in 1910. The A.H. Fox Gun Co. was established in 1905. So my thought was that an experimental/prototype for the Ansley H. Fox gun would have been even earlier? Just pure conjecture that someone may have gotten ahold of this prototype Ansley H. Fox gun and installed an Infallible Trigger. A.H. Worrest's patents (1,013,254; 1,029,781 and 1,029,782) that apply to the Infallable Single trigger were, were applied for from June 25, 1909 to October 16, 1911.
The Fox shotgun with an Infallible Single Trigger, pictured in the Lancaster Arms Co. catalogue, is sort of a bizare combination of a Philadelphia Arms Co. gun and an A.H. Fox Gun Co. gun. --
