Found this Colt 357. Entered the serial in on the colt website and it dates to 1958. Other than that I don't know much about these older colts. I'm guessing pre Trooper?
53, was the first year of production,this was introduced as colt.
premium 357 with better fit ,finish an tuning,the trooper was the cheaper model of the two, nice example of a older colt, great find,the super premium python helped lead to it's demise,
Trooper was a revamp of the officers model,colt 357 as stated were better fit and finish, the first troopers were 38 special only, then upgraded to 357