Richard Simmons
Member
There is the very light J frame aluminum model 12 if you stick to normal loads . In 1984 the 12 switched from the thinner original frame to a regular J size and lasted until 1986, then dropped.
Hard to find, but you almost don't know it's there, on the right in this pic, earlier model on the left.
![]()
The Model 12 has always been a K frame as far as I know.