One is S&W Model 10 .38spcl and one is Colt 45 service revolver. I have the serial numbers but S&W says it will take 8 weeks to get an answer back. I know for shotguns there are sites where you can get the serial number ranges by year. All I know about mine so far is its after 1920 (above ser number 20,000). Anyone know of sites where I can look these revolvers up?