Toroflow, thanks, I believe your right. My standard catalog of firearms had said it was made from 1909 to 1911 but i just looked in Jenks "History of S&W" and he says to 1920 though this one with a 24xx serial # would have been in the 1st yr., I think. Jenks also said that they were made with the 2 locks (top break and thumb release) for law enforcement use so the bad guys couldn't grab the gun at the top break and dump all the ammo. Interesting, I hadn't heard that before.
H08