I have but two,

28 no dash four screw, S194XXX
28-2 purchased by me from F.Morton Pitt in LA in 1968 S294XXX

Both Diamonds of course, the 28-2 large grips.

Note the serial #s, I didn't plan that, it just happened.

(embarrased, can somebody point me to one of the "how to post a picture thread)