Louis,

I concur with Oganza - that the gun is Japanese. I have a Kasuga 20 bore with the proof mark that's a BV under a Crown. I'll post some pictures soon. In the 90's the Gov of Japan required all guns to have a serial # of 11 digits or more, so many older guns with shorter serial #'s were re-stamped with the new 11 digit serial number. Japanese proof marks are almost non-existant on older guns and there seems to be have been no standard.

Oganza, It looks like on of your pics is a Kasuga (with the scalloped action) - is it?

Sincerely,
Patrick