Yep, what everybody said! The model 66 was so popular that as of last year, S&W re-introduced it to the public after being "out of print" for, what, Guys, 20 years or more?
Of course, the new 66 is not the same gun as the old one's. Re-designed frame, ALL mim parts(The future, I'm afraid. (Sighs), and now w/ a 4.25" crush barrel. I am sure it works just fine and shoots well, but comparable w/ the old "dash" 66's? Not at all, IMHO.
Take care of that 66-3, you have what Bill Jordan used to call the "ultimate Law Officers duty gun". Also, like another member said, a steady diet of hot 125 grn .357 loads can cause damage to the frame and forcing cone of the barrel. A few won't kill it, but 50 rds a week for 6 months to a year of really "hot" .357 125 grn loads and it will give up. And S&W cannot repair it, either. Too long "out of print", and is considered obsolete by S&W. You will probably not shoot enough rnds thru it in your lifetime to have any worries about it. You have a real Treasure, believe me.
Did I mention I now officially hate you!.....lol! In jest, of course.
Lucky Guy, you!