Can anybody help to identify this maker's mark?

Can anybody help to identify this maker’s mark? I can’t find exactly this anywhere:
JG over S in a shield - pic. attached.


Many thanks



I have been waiting to see if you get your picture posting sorted out in the hope that the full hallmark would give things like assay office and date. These details are important as we stand no chance of making an identification without them.

You can either use the tags to embed a remotely hosted picture in your posting or the “Add an Attachment” facility to upload a picture from your own computer.