Quote Originally Posted by ccdjg View Post
That is a surprisingly high serial number for the semicircular trigger guard, but it fits in with another reported example with the same type trigger guard which has the even higher number 4549. Currently the lowest known serial number with the second version trigger guard is 2065, so I think we can conclude that there was quite a long period of overlap between phasing out the large semicircular guard and introducing the neater recurved type, an overlap covering around 1500 production models.
Just got home and checked mine(see earlier post) ser/num "1943" .22 and it has the later style recurved guard.