The lockwork configuration appears to be standard Chamelot - Devigne (sp?), which was a VERY common and very successful European design first brought out in the late 1860s or early 1870s.
The Nagant lockwork design was related, but different.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.