If you pull the grips, does it have three or four screws holding the side plate to the frame??? If four, it's one of the older ones and worth really checking out...If three, then it's one of the newer series K frames...You can usually go to your local gun shop/smith and they generally have values by age/ser. #, but the prices are possibly out of date by the time most of the books are published...Model 19s were a pretty common LEO issue back in the late 50s and through the 70s...