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There are no modern makers with the initials "DD" or "D&D" that I'm aware of, so I'm assuming it's a 19th century flute. But I haven't seen any listings for makers with those initials in Britain or America either.
Following up on the "DD" line of thought, Daniel Deitch is a flute maker (now retired, but still doing repairs) based in San Francisco. He used to make several models of baroque flutes and a variety of other instruments. I do not know what his maker's mark looked like, but he has the right initials. Looking at the pictures, I see that this flute has an unusually small, baroque-like embouchure.
This following website listed a flute on 11/18/17 and claims it is also a Daniel Deitch flute. It is a baroque flute with the same maker's mark.