Howdy
I have to disagree about the explanation for the spur on the trigger guard of the Russian Model.
This 2nd Model Russian left the factory in 1875. I have fired it both the conventional way and with a finger hooked on the trigger guard spur.
Much more awkward and uncomfortable to shoot using the spur as a finger rest. Just does not work as well as firing it conventionally.
As most here know, the 1st Model Russian looked exactly the same as the American Model. Same grip shape, same lack of the trigger guard spur, same everything. The only difference it was chambered for the then brand new 44 Russian cartridge.
For the next build, the Russians specified the big 'knuckle' on the grip and the trigger guard spur. The reason given for the knuckle was it prevents the gun from rotating in the hand in recoil, which it does very well.
The most common explanations for the trigger guard spur are.
Finger rest,
parrying sabre blows,
hanging the pistol from a sash or belt.
None of these really makes any sense. If any of them were true, why were the spurs cut off so many Russians that made it to the Old West.
And why, was the trigger guard spur deleted from the Schofield Model?
And except for some sold to Japan and Turkey, why did the New Model Number Three not have the trigger guard spur, if it was such an improvement?
The simplest explanation is, the Russians wanted the trigger guard spur because it was a more European embellishment.