Help! Chinese Beaker / Mug / Cup. Rustic But What is it!

Hi

I'm hoping someone might be able to help me, we found this Chinese, Beaker, Mug, Cup, In my Uncles attic in a box of Porcelain, it appears to be Chinese has a mark to the base, I think its copper, however it's black mostly with an embossed Dragon motif going around it, its quite worn and pitted.


Any help would be most welcome especially the mark underneath a used some water and a tooth brush to reveal it as it was covered in the black stuff

Regards Lee

 

Mark is upside down, appears to be 庄 sho, the outer bracket I don't think is part of the character. It's Japanese rather than Chinese. The dragon detail may be antimony, and if the body is in copper it was probably silver plated originally. Looks typical for early 20th century dating.

 

Thank you, spun the beaker around and I definitely see that mark now