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It's pewter. The mark on the left is that of The Association of British Pewter Craftsmen, and that on the right is that of the Worshipful Company of Pewterers.
Always embed your images, as very few people will click on such links.
Not really sure, but perhaps part of a date letter system?:
The Association of British Pewter Craftsmen was founded in 1970, and I believe the 'Seahorse' mark has only been in use since 1980.
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