The rib on a Triumph Hammerless --
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The patent date on the two Triumph Hammerless guns I have pictures of is June 16, 1885. There are two patents with that date in Larry Schuknecht's book -- P
.A. Altmaier No. 320,038 for a Safety and F. Beesley No. 320,040 for a Hammerless Cocking Mech.