Customs Seal, British, Initialled, SD

Customs Seal, British, Initialled, SD, Image & Found by Brian McLeod.
Found in the north east of Scotland, 20mm.

S.D. // crown

It has the same style as inscribed U.K. customs and excise seals, see others on this page.

The Tudor crown indicates it is from a date before 1953 - Wikipedia.