J.C. Seal, Image & Found by James Crombie.
Found in Yorkshire, 23 X 18mm.
Bulla type bag seal with J.C. / ?C and on the other side U.C. (or possibly П.C. or even Ц.C.) with a five petalled flower head above, all in a border of fused pellets.
No product, company or organisation has yet been associated with this seal.