I have posted the mark on a silver forum as well to get more info and it looks like it is an 1888 hallmark! Surprise surprise... A forum member there posted an identical mark which has been identified as 1888. Apparently, the date letter series for 1881 - 1899 used oval letter dates and also the square with chamfered corners concurrently. The attached date stamps show them.
Cheers,
Alex
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