Silver Plate Individual Tea Carafe GlassCup need identified

[color=black]Hello, I’d really like to identify this piece, it’s date and maker and especially the hallmarks which are on at least two parts of the piece, it’s silver plate I assume!
Hallmarks: MB in a square/rectangle. plus a diamond on it’s side with what looks like a French cross in the middle and the letters ‘J’ and ‘A’ on either side. MB may possibly be Matthew Boulton (Birmingham)
Thanks in advance
:slight_smile:
Hallmarks-sml.jpg
SilverTeaCup1sml.jpg