Yes, photos of the backstamps would be very helpful.
Thanks so much!
Thanks for the additional pictures. The china is beautiful. However, I've been unable to find its manufacturer. It isn't in pattern books of any of my resources. Replacements.com has a picture of it, but they have been unable to determine the manufacturer as well.
I will opt out since there doesn't seem to be an answer to your question.
This is handpainted flow blue "Gaudy Welsh" British ironstone china from as late as the 2nd quarter of the 19th century. Without a make name stamped on these, who made these cannot be definitively stated, though these likely originated from the Staffordshire region in the UK. The hand painted and impression numbers on the back were in-house quailty control codes and they cannot be used to trace the maker. In general, the average sale price for fine English flow blue Gaudy Welsh ironstone china is $75 per piece.