www.925-1000.com

This is a small book shaped article that measures 1 1/2" x 2", I am thinking maybe stamp holder. I have no idea what the marks mean??
I am assuming KGM is the maker's mark, the u is the date, the next mark shows three crowns (two on top and one on the bottom), and finally X6

Can you help educate me please?

Hi,
It`s solid silver, Swedish.
Take a look here.
http://www.925-1000.com/Fsweden_Date_Code.html
Cheers

Solid silver!? Silver it is but 830/1000 (the three crowns/cat's paw mark). It is made i Uppsala (U) in 1900 (X6) by Knut Gustaf Markström (KGM) , active 1883-1915. Nice jugend influenced object.

No misunderstanding. The item was posted as ‘Silver Plate Hallmarks``. When referring to solid silver I meant a single silver alloy and not a coating or plating over a base metal, i.e. silver –plate.
Regards