www.925-1000.com

I have made some progress with these marks. Looking at those posted by others on this topic, especially Theoderich, it seems that the mark indicates '100 g', which derives from a German flatware standard. So this would indicate that we are dealing with a silver plate mark, where the '100 g' relates ...

I have recently purchased a snuff box showing identical marks to those posted by Theoderich.
Any suggestions as to origin welcome. Additionally my box is marked "1 & 20 BIZ" which I understand is an abbreviation for the German Jewish wish that you "live to be 120"