Model of '91 aka .38 Single Action 3rd Model
also, sometimes the .22 Single Shot 1st Model.
added: The 3rd Model is normally seen with a trigger guard (held on with pins)
Occasionally found with a spur trigger and if documented as shipped that way it
is called a "Mexican Model" and is worth a premium, however the Spur trigger was also offered
"after market". Not worth as much......
Instead of Model 91, should be Model of 1891, Therein, lies the confusion., However the barrel is usually marked Model of 91, So Demorriow is correct . Heck, I'm even confused and I've been paying attention In the bible it is under 38 Single Action 3rd Model ( Model 1891 ), but the barrel is marked Model 91. got that, don't make me come down and smack your wrist with a ruler.