There are three major variations of the № 3 as delivered to the Russians during the first contract:
1. First issue - revolvers with old style straight bottom frames, small trigger pin, old style hinge pin, and marked with assembly numbers. Some of these may be missing some of the first mechanical improvements. Of the approximately 500 first issue revolvers that were manufactured, so far, only two pieces are currently known.
2. Second issue - revolvers with old style straight bottom frames, the small trigger pin, old style hinge pin, but marked with full serial numbers instead of assembly numbers. Approx 2500 pieces manufactured. (revolvers have been observed with high, 5000ish, serials? Datig)
3. Third issue - guns with new style (enlarged trigger pin boss) frames, enlarged trigger pin, new style 2 piece hinge pin, and marked with full serial numbers. Approx 15-17000 third issue revolvers produced.
The original Smith & Wesson №3 "Americans" had been produced with a full serial number on the butt and the inside of the right grip plate. Assembly numbers were put on the major parts; the master assembly number on the frame was found on the right side of the butt portion of the frame underneath the right grip plate and the matching assembly numbers were located on the face of the cylinder, the barrel latch and the rear face of the barrel extension.