Originally Posted by Drew Hause
Bore is 16.1 mm = .633"
19 gauge is .626"
18 gauge is .637"
L choke is 15.3 = .602"
R choke is 15.5 = .610"

Could it be Japanese? That may be a Miroku maker's mark on the L flat and they made some 18g

No clue. Here is a link. I have no plan on bidding, but the lack of proof marks on a German gun threw me and then the bore diameter really threw me.

https://hibid.com/lot/259825792/german-sxs-20ga-exposed-hammers-engraved?ref=catalog


foxes rule