Günter:

Getting back to that intertwined JY/YJ stamp, a single version of it appears on this Sauer 37xxx, so it may represent a descendant of the tube maker or a collaboration.


Sauer 16 bore hammergun





And the intertwined stamp is seen on this Jan Furbacher Mesto Zdar, Vysocina, Suhl sourced, A&D boxlock from 1932.

Kind Regards,

Raimey
rse