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Just to update my post, I contacted the Assay Office in Edinburgh, who have confirmed that the date is definitely 1883, and the reason the Queens head is missing is because the weight of the Silver would have been too light to pay tax.

I wondered if anyone could help or advise I have a pair of scottish sgian dubhs - one I believe to be decorated with brass, the other silver. The silver hall mark shows a thistle, a castle, a lower case b and the makers mark of Marshall & Aitken Edinburgh. I have been told that the year could po...