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No guarantee it's Derby china at all. I took it to the Royal Derby Musem and was told it was probably not by a traditional porcelain painter.
It's circular, oil on white vitroline glass about 11" diameter, a spray of pansies
Signed A W Gregson1896.
I'm an experienced family historian so had no difficulty assembling a set of documents and copies for an Albert Gregson, painter, Derby etc etc BUT unfortunately there is one flaw. His deatn occurred in 1895.
I can find no other candidate, but who is to say it's not by an American or whoever?
I can think of several fanciful reasons why a painter might misdate his work but what is needed are facts.