Yes, it does have proofmarks and they are Belgian
If you could post one or the other side more clearly
we might be able to provide more data.
It does have 65mm chambers and was proofed before 1922
http://www.shotguns.se/html/belgium.html
Mike

Last edited by skeettx; 01/24/16 08:02 PM.

USAF RET 1971-95 [Linked Image from jpgbox.com]