I defer to Lustrousstone's knowledge - it avoids long winded debates

- but I'm having trouble seeing this as English. Celeries were made in prodigious numbers, but you're very lucky to see anything other than clear examples - there seem to be only a very few in anything else - for example Brockwitz made one particular design in blue, red, clear and I think carnival.
I've trawled the usual suspects for a match, including Silber & Fleming, but can't see this design. There are many of course that lack a Rd. No., so that's an unhelpful way to go.
What was the origin of this piece, for you?