The duty pistol of the USAF was a S&W Model 15 Combat Masterpiece,,,During my term in A.F. we carried smith n wesson with 4 inch barrel in 38 sp w/ball ammo.
The main difference in that and this gun was a ramp front sight and adjustable rear sights.
I know exactly what the OP's revolver is,,,
I'm looking at a picture of it in one of my S&W books.
But his response to Holly's nice post was rude and socially unacceptable,,,
He can now do his own danged research as far as I am concerned.