Probably Kansas Highway Patrol. Smith sometimes makes a commerative run of pistols and sometimes a large customer will order special markings on a standard model.
The frame size of a Smith and Wesson model 66 is K.
The smith and Wesson model 10 has the K service frame.
No, it is an L frame.
It is a K-frame.
K frame
The Model 13 is on a K frame.
No
I believe it to be the K frame
K frame
If you mean a Smith & Wesson Model 629-1 revolver, it is stamped on the bottom of the grip frame. It will be covered by the grips. A secondary SN is usually stamped on the frame under the cylinder crane. Open the cylinder to see it.
I frame
N