Lancaster

however, in the IAA forum discussion
https://forum.cartridgecollectors.org/t/9-5-mm-peterlongo/46287/8

there is this note:
"....but please note this one is a different cartridge designated “9.5 mm”. The 1926 catalog where it came from also includes the 9.3/9.4x60 Peterlongo...."
One would assume that Peterlongo (actually Richard Mahrholdt) knew back then what he was offering.

I have now linked this thread and the one in the DG forum to the IAA forum thread - hope these guys have more information
fuhrmann