A model 64 is a very fine 38 Special revolver. When I joined the U.S. Dept. of Defense Police in 1994 my issued duty weapon was a S&W Model 64. Some of our 64s had more than 50,000 rounds through them. After we traded them in for our current Berettas I heard that they were X-rayed and some were discovered to have stress cracks for so much shooting. A 64 under normal use will last several lifetimes. I doubt you would put 2-3000 rounds of full combat +P loads each year through it the way we did.