I have a very late Lefever Arms Company H grade with a very high serial number (over 73K) which is fitted with an Infallible trigger. I can't prove it but highly suspect it was installed at Ithaca when the gun was built. Can't say for positive if it was before or after The Great War, but also suspect it was one of the near-final guns to leave Ithaca. Frame & barrel have different SNs 4-digits apart. It has the 1907 patent date & while it has H style engraving, Doll's Head & Cocking indicators it has DS wood. Un-capped half pistol grip & no Escutcheon nor metal tip in the forend.