It's a Model of 1905, 3rd change, made about 1914-15. Close serial numbers shipped at that time. It has been refinished and the pearl stocks are not original to the gun. The refinish was poorly done and includes the hammer and triggers which originally were case hardened. Value is only as a shooter, not as a collectable due to the unoriginal condition, but as a family heirloom the gun could be priceless. Tell your friend to get as much info. as he can from the Police Historian of the dep't were his grandfather served, to go with the gun , and then order a S&W factory historical letter to show where the gun was shipped, to whom and the original configuration of the gun. The gun and the info. & letter will make a nice package for future members of the family. There's a link on this Forum to the application form for the factory historical letter. Good luck, ED.