Star of David Seal, Image & Found by Jorvik Andi.
"Found in the Parish of Naburn, North Yorkshire.
It shows the Star of David on one side and on the reverse shows the figures “725”, it measures 14mm X 16mm."
Bulla type seal with star of David on one side and the number 725 on the other. See other Star of David seals especially - BSG.BS.01184, Leeds Phosphate Works Ltd. "Incorporated on 12/2/1894 – 'To carry on the business of Agricultural Chemists and Artificial Manure Manufacturers and Dealers in Artificial manures of all kinds.' Dissolved at Extra Ordinary General Meeting at Newcastle-upon-Tyne 30/9/1921. From National Archives, Kew."
The same marking is found on specifically labelled guano seals, see BSG.BS.01178.
