My #93 is the lowest I have seen personally, but 38 and 39 are really early ones. On the earlier models I also like the knob that detachs the forarm. The curved frames around the hinge pin is something else that will show a gun made in the first year or the very first years. Even more rare is an early one without the side panels. I would love to see pictures if you guys can get them. Thanks and good luck.