Diamond shaped hallmarks..

Can you please help me identify the maker and year of these hallmarks? Also, does the mark A appear as a grading only on EPNS or sterling silver too? Thanks. :smiley:
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I don’t recognise this trademark - note it is not a hallmark. No, A (or A1) does not appear as a grading mark on sterling; the sterling standard is enough by itself.

Thankyou for your quick response! Does that mean that it may be someones personal monogram?

No, it’s the trademark of the manufacturer.