Stunning, Super Crisp Hand-painted c. mid 19th Century Mug with Greek Key Pattern electrical charge meter I’d guess it dates from

I’d guess it dates from second half of the 19th century

I can't find a definite date

which looks hand-dyed to me

mostly where the sides meet the bottom

which I sold a few weeks ago

Stunning, Super Crisp Hand-painted c. mid 19th Century Mug with Greek Key Pattern electrical charge meter I’d guess it dates fromI purchased this bright white beauty of a mug with hand painted "Greek Key" decoration from a dealer in New Hampshire with always unexpected things at great prices; recently from him I grabbed a huge, fine, 18th Chinese export punch bowl with gorgeous staple repairs. I've done a fair bit of searching and can find no exact likeness, but turned up a couple of references, the most useful a c. 1863 Copeland (British) basic and pitcher with hand painted