This is my pistol, #sn 1992, all numbers matching (frame, latch and barrel)
The 6" barrel is marked "Model of 91" in the middle of the adress/patent marking.
According to the literature (S&N, N&J), it is not possible to find Second Model in a different caliber than the .22 LR.
We should note that this frame could only shoot centerfire cartridges, unless the barrels were chambered (or sleeved) to .22 eccentrically (unlikely, right?)
The triggerguard spur and frontsight appears to be original, too. The grips (with internal lead weight), unfortunatly not.