The forend is not original to the gun. You can see a much later S/N on the iron in the one photo and it looks to be a latch type forend from a grade 3 whereas the gun should likely have a keyed type forend.
Other than that, it is a very interesting gun. The locks are the "3 pin" type which would suggest a grade 2 platform, however the engraving and frame sculpting would suggest a grade 3.
The U stamp on the water table would indicate the grade designation.
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B. Dudley
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