I did omit one detail of mechanics described to me. Has tang auto safety but direction of safe/offsafe is contrary to the cstomary fwd to off safe, aft to safe. This cued me that he might have something extraordinary enuf to have an extra toggle in there not demanded by absolute necessity. No mention of underlevers or toplevers either so I assume it's in the modern idiom and not closed by a cam or screwgrip.
Thanks very much, Mr. Petrov. I will pass on your comments and encourage my friend to go in search of the Plummer book altho I would guess that finding a copy is not easy.
jack
