I bought this a couple of weeks ago from "noconeetrader" aka Handejector...
It is a very very nice early model 42 from 1958. S/N 12284. The interesting thing about this is the very late date to still have the "bug screw" on the upper side plate. I have some early examples from 1953/54 with the Bug screw. See earlier posts. July 18 2013.
However, Peter2772000 has one 50 numbers different from mine also with the Bug Screw. Sn 12234. So the Bug screw may have been used much later than stated in SCSW. It is also possible when the upper side plate screw didn't seat well they just used them randomly until there was a design change.
The pics are from "Noconeetrader" His are better than I could take.
