The S&W Model 10
The Model of 1905 4th change, or the M&P, remained essentially unchanged until after World War II, when a short throw hammer was introduced. Minor changes, such as a new front sight, fewer screws in the sideplate, and rubber grips were to follow. For decades, it was the sidearm of choice for law enforcement. It is the ubiquitous revolver. Today, S&W still sells the Model 10, and it is not that much different from the Model 10's of old.
Because of the large number of Model 10s produced over the years, they can still be purchased used for a very reasonable sum, often in like new condition. Recently, I have noticed a decline in the numbers of Model 10s I see for sale locally. For years I purchased them for $150-$175. I am having to adjust my mental market value to $200 and above now, if I still want to buy Model 10s. That is fine by me too. The Model 10 is worth that, and it always was. In fact, it is worth more. It is ultra reliable, fires a defensive caliber, is accurate, and fun to shoot. That's a combination often absent in guns that cost hundreds more.