Dating a silver-plated stein/teapot

Hi, I’m just trying to unscramble these marks to get a date/origin for this silver-plated beer stein or possibly tea or coffee-pot? Any help would be greatly appreciated!

The letters are the gothic style EPBM.
EPBM stands for Electro Plated Britannia Metal.
Silver plate was originally produced using copper as the base metal but this was very expensive. In the 1840’s, George Elkington developed a commercial method of electroplating. This used a mix of tin, copper, antimony, bismuth and zinc. It was called Britannia Metal and it resembles pewter.
Unsure of the marks in the shield.

Thanks for your guidance! Cheers, Craig