Late 70s. $125.00 for a new nickel 4" model 19.
Hi:
Model 10 4" SB blued $48.80 in 1963 (Police Discount Cost).
Entering L.E. I had a 4" Colt Trooper .38spl (Used) that I traded a 9mm 1915 DWM Luger for. The older Officers carried S&Ws. As soon as I could save the money I purchased the Model 10 thru the Agency.
I still have my first service revolvers (Colt and S&W).
Jimmy