Just a guess, but I would think the Cossack Cavalry would have still have had S&W revolvers up through WW1 and many surfaced during WW2. The S&W Russianicon in 44 cal was designed as a cavalry pistol with the extended spur to the rear of the trigger guard.
the Russians bought quite a few 1st, 2nd and 3rd model variations from S&W plus the copies that were made.

Photo shows my S&W Uberti 44 Russian, doubt the Russians had pearl grips except for high ranks or presentation Attachment 101164