I've got an old Police Trade-in S&W 65 I've had for 20 years or so (FWPD stamped). Got it from a buddy of mine on trade for a Gen-2 Glock 17 I had bought for $100 back in in 2002. There is no telling how many rounds have gone down range out of this thing. But I can guarantee I've put at least 15,000, probably more like 20,000, through it myself - low end estimate. Most of my loads have been 158gr SWCs and 148gr WCs at 38spl velocities. I've fired maybe 500-1000 magnum loads out of it in total.
The revolver has a decent bur on the cylinder stop slots, probably from one of the former owners spinning the cylinder while closing it up. It came that way, but has still been quite usable to this day. The revolver also came with a decently worn firing pin hole on the frame. Again, nothing making the gun unusable, but it is an eye sore. The revolver has also developed a bit of endshake over the decades of service. Measured this with a feeler guage the other night, I measure the cylinder gap at 0.010", leading me to believe that it has seem quite a few magnum loads while in service.
Now the pros... The gun is still very accurate, with a smooth as glass barrel. Despite having a minor imperfection in the crown that almost looks like someone removed the end of one of the lands. The gun locks up tight enough, and doesn't appear to have any significant timing issues. The old sights leave something to be desired by today's standards. But it's still a good shooter. Though, it's not quite as pretty today as it once was.
With that said, I'm trying to figure out what I do with it now. Obviously I could always retire this one to the safe and buy a new one. But I also feel like the gun still has some life left in it. And I'm always cautious about the quality of modern S&W firearms. It wouldn't take but just a little elbow grease to shim the cylinder to alleviate the endshake problem. But then when looking at the cylinder stop slots, the firing pin hole, and the potential for future cracking of the forcing cone on this K-Frame with Magnum loads I'm curious if having any real work done to it would make any sense, given it's probably 40+ years old now. Not to mention, I'd probably have an easier time finding beach front property than I would have in finding a decent pistol smith in Oklahoma.
If this were you, what would you do? Put the 'ole girl out to pasture? Give her a tune up? Looking for suggestions if you haven't guessed....
EDIT: Added photos… It's a little dirty from the range this weekend. But should be good enough to tell it's condition.