I still content that the Machac peddled example was finished in Prague and comparing OWD's Jaroslav Holecek's, of Hradeck Kralove, peddled Belgian self opener:
which only wears the import mark and year.
Another of Jaroslav Holecek's retailed examples has very similar screw and pin configuration. Holecek preferred very short tubes similar to Churchill, as well as multiple barrel sets.
Below a Joseph Cap example:
This Joseph Cap example, which lacks the side frame reinforcement, wears an encirced "F" which I think is the import mark for Austria.
Kind Regards,
Raimey
rse
