I am retired USAF and an accumulator of many different types of firearms. My current S&W pieces are a US Military 1917 in .45 (not a Brazilian), a 4" Model 15 (exactly like I frequently carried on active duty in the AF), a 4" Model 19, a 3" Model 36 square butt, and an old Police turn-in Model 39. Hope to learn more about S&Ws here. Found this site via an aquaintance while looking for a 4" Model 10 (like I carried in the AF when I was not carrying the Model 15).