OWD.I believe that this action is a variant of H.Tolley patent #461 of 1877. The origional patent was intended as a self cocking system for hammer guns.J.& W.Tolley often utilized the patents of H.Tolley in their guns;for example in their "Giant Grip",actions. The F.Beesley patent #31 of 1880 for a spring cocking hammerless gun post dates the Tolley patent.This issue is reviewed by David Baker on page 104 of,"the British Shotgun Vol;2. David Baker gives credit to H.Tolley for the invention of the first action for a spring cocked gun,but then elects to group it with other inventions for self cocking hammer guns.