Trying to figure out if this is sterling or plate

Trying to figure out if this is sterling or plate
Hrmmm it doesnt seem to have the official hallmarks of british sterling. This is supposedly a mug from the 1800s and probably from britain. likely plated?
This website is invaluable - www.925-1000.com for hallmarks.
It looks to me that the mark says "EP" which means electroplated.
Thanks mate, I found the hallmark and it is indeed plate. Still on the lookout for a sterling mug. Why drink any other way?