What do we have up to now:
4 different guns of English/Austrian/German-Suhl/Belgian origin.
The smallest common denominator is that ALL of them emerged in US,
possibly in the 60's/70's went-through/landed on some bench
and got this stamp/mark.
Then, who may have had this initials W J N ? (as it may not be
a compulsory US mark )
Cheers
Felix Neuberger