I started as a jail deputy in 1981 and used my personally owned M64 for transports and hospital duty since Jailors were not issued revolvers. Traded that one for a Dan Wesson .357 and was eventually issued a few different S&W sixguns until we started issuing Austrian plastic in the late '80s.
My last issue revolver was a M64 .357 that was taken off a man attempting to enter the courthouse many years ago. I still remember the serial number - D672999. Wish I could have bought it...