The Smith and Wesson K frame revolvers were made from 1946-1983.
1963
1975
@1964
1971
it was made around the 1960's
The frame size of a Smith and Wesson model 66 is K.
The smith and Wesson model 10 has the K service frame.
The crane yoke on a Smith & Wesson revolver is part of the cylinder assembly, connecting the cylinder to the frame of the gun. It allows the cylinder to swing out for loading and unloading. The yoke is typically located on the right side of the revolver, pivoting at a hinge near the frame. In contrast, semi-automatic Smith & Wesson pistols do not have a crane yoke, as they utilize a different mechanism for operation.
The frame.
Standard Catalog of Smith and Wesson Firearms by Supica and Nahas History of Smith and Wesson by Jinks.
Next smallest to the X frame.
K frame