Charles,

All original models as shown in your post have a pin retained in the grip frame, hidden under the stocks to lock down the grip safety if desired. Shown in Absalom's post #6.

Original models made on the JC and JAC (airweight) frames were discontinued in 1974.

When re-introduced in the late 1980s the grip safety was deleted as on the most current versions.

However there was a short production run of the re-introduced version in the Classic Series with the grip safety, Model 40-1, w/o internal lock.

357 Mag versions are made on the JM (magnum) frame.

__________________
Jim
S&WCA #819