Can't find info on these hallmarks!

The Basics... Identification Help - What is it?
1

I have been trying to identify these hallmarks of what is most likely silverplate. The marks are as follows:

RD388330

B H & Co

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fork3
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X/Y in a shield

The pattern is pretty cool, so you would think it would show up in one of my innumerable searches!

Many, many thanks in advance!

2

1902/1903.

Still searching… :face_with_monocle:

I give up. :confused:

3

So glad to know it’s not just me! thanks so much for trying!