NPO Seal, Image by StuE, Found by Craig Carter.
18x20mm. 8.3g.
The centre has NPO or possibly NPC surounded by 3 concentric circles the first two are close together and filled with a continuous chain of pellets the third is further away creating a wider annulus with writing in it. Only the following letters can be deciphered - ET??L(U?)??????A???TATE? and a possible small splayed cross. The other side is blank.
No product, company or organisation has yet been associated with this seal.