I believe it to be a K frame in 38 cal..............
It is a J frame.
I frame
You will need to check egunparts.com
K
The smith and Wesson model 10 has the K service frame.
The frame size of a Smith and Wesson model 66 is K.
bone grips, chrome frame snub nose.
You will need to check egunparts.com
L frame, blue steel revolver in 357 Magnum
Can't be answered without a detailed description of ALL markings and caliber.
The frame.
The Smith and Wesson K frame revolvers were made from 1946-1983.