Unknown continental mark - your help needed

This is a small solid silver bowl which has the marks Ive shown - can you recognise any of them. A COUNTRY OUTLINE WITH BR INSIDE. 3 HORIZONTAL LIONS IN A SHIELD. INITIALS E.g.G. . L IN RECTANGLE. SLG ABOVE SILVER. Its got me baffled.

This is a Guernsey (Channel Islands) mark.

Hi - a huge thanks for taking the time to help out and an even bigger thanks for pointing me in the right direction to do further research. Great stuff !!! Cheers Paul. P.s. Within the last hour I have found out the maker and year of this guernsey piece - completely due to your assistance.

That is the mark used by Bruce Russell of Guernsey.