I am no expert, but it appears that S&W still makes the Model 36 and the price cited at their web page is $735 new, which means a dealer would charge somewhat less, perhaps around $595 or a little less. You may be fooled by its somewhat older appearance, since it is sold as a sort of new collector's item. It is designed to fire the stepped up ammunition .38 +P that you wouldn't want to fire in the older examples of this revolver before it was given a model number. That's probably a little more than I know. To get a guesstimate on the age of this particular piece, you probably need to see your local gun shop or gunsmith.