pictures of the number and letter would be good please.
Thinking possibly Thomas Webb decorated by Mr Giller as one possibility to explore?
No time to look at the moment but if you put in Webb etruscan search on here a thread might come up?
Also check out CH british Glass the first book - something in there about a vase that appeared as Molineaux Webb on the Great Exhibition list but it is thought it might have been Richardsons? can't remember details of that one but recall a pic was posted and yours might have similarities.
But am sure the black on white with red highlights was described in the ARt Journal pics and info I have somewhere and that some of the designs on yours match some on those vases in the Journal - no time to find it at mo, sorry, but will try and look in next few days.
m