The Ithaca "double thick nitro breech" bs started about 1900
1903
L.C. Smith started the "broad breech" marketing back in 1886 while still in Syracuse
And Hunter Arms the "Guaranteed Never to Shoot Loose With Nitro Powder" about 1897
One way Lou Smith found to dispose of the Damascus tubes; previously shared by Brad Bachelder. 1922 Lefever Arms Co. (Ithaca) Nitro Special (introduced in 1921) with fluid steel right and 3 Iron "Oxford" left tube stamped IHR, likely Heuse-Riga Fils known to supply damascus tubes on Flues models. Barrels were originally blued
I'm thinking the barrel finisher knew
Hybrid Mode