Apparently the gun was made in London as it has all the marks shown in the 6th column down at this site.
http://www.shotguns.se/html/london_marks_in_context.html

Still strange that it has those barrels done in the Cabelas Francotte Star pattern that contain a London provisional proof mark (bottom dancing lion).

One other thing is that instead of the mark 12 over 1 mine is 13 over 1.