Image from the research effort of Piotr J. Bochynski who kindly forwarded me his articles with much information on the family.

Stepped lock pistol of Jakub Ernest Stapf Varsovie or Warsaw who was of the German Stapf family of gunmakers who moved to Poland. It seems that the transfer of technology to the Polish hunters/makers occurred thru a Russian conduit and the terms and ideas are Russian oriented.

Kind Regards,

Raimey
rse