I'm looking for pricing info on a S&W Model 10-2. It is a 4" barrel model in like new condition, with an asking price of $460. Can anyone give me a ballpark range of what years the -2 model were made, and what the approximate value of the gun would be? Is there anything in particular I should be looking for when buying a vintage Model 10? Are there any model years or variants that are considered to be more desirable? Thanks!