1929 Gun. 559500 started in 1930. A fairly "early" O.Police a few years after the change from the nearly identical Army Special. Should have wood stocks,with silver Colt medallions and nickled screw/escutcheons on the stocks. These guns are usually very well fitted and finished,unless messed with over the years. Should also be more able to digest +P ammo than the older Colts and S&W's contemporary Military & Police Models.
Hope his is of help;
Bud /forums/images/graemlins/smile.gif