I many try to obtain a better pic of the hammers & pin configuration if I can locate the source.

I'll have to look but I think this Sauer Lefaucheux longarm was pictured in Dixon's text. But it would fall in the 1876 to mid 1880 period also. During this period Sauer could have easily and may have sourced many of its components or longarms.

Kind Regards,

Raimey
rse