Welcome to the forums from the Wiregrass! A 3" Model 36 with a floating J serial. The floating J was used in 1971-72. Your picture of inside the yoke cut obscures the model number. Look again on the frame, not the yoke arm.
Thanks for all the info. This confirms what I thought. It was the pistol that my grandfather was issued as a city bus driver. They were required to go to the police academy to the fire arms class to become certified to carry on the bus. Kinda crazy.