"Unless the article is exempt"
The document that describes this is here:
https://assets.publishing.service.go...e-internet.pdf
Anything which is sent abroad is exempt and does not need to be hallmarked. You do have to comply with the rules and regulations of the destination country.
I would sell it as white metal and not hallmark personally.
For USA I have heard that it is good practice to give the pieces the fineness mark, so 925, along with your makers mark. It's a way of saying that you as a maker verify the metal and they can trace it back to you.
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