I picked this gun up today (well, it's on the way). It is a JP Clabrough & Bros model 681E. Doing some on the net research, I find that JP Clabrough & Bros was used from 1870 to 1883 when it then became Clabrough & Golcher. In 1893 it became Clabrough & Johnstone. This has proof marks of Bp, Np and BV all with a crown. From what I found on the net, these are used from 1904 on. Is the info I found on the net wrong because from what I see, the proof marks don't jive with the Clabrough & Bros years of 1870-1883.