
Hi and welcome.
If reversed, the mark seems to read E3, with a crown on top.
They do look to have a slightly unusual pattern cut into them, but I cannot make it out because of the fussy background.
It also might be easier to track a manufacturer down by the pattern rather than the mark.
Would it be possible to get hold of a pic with a plain black (or white) background? Maybe putting the paper or a black sock inside the goblet, so only one side shows and the image doesn't get tangled up with the far side.

Don't worry about being in the wrong section.
I'll ask one of our lovely helpful mods to fix it for you.
