Dutch, Rotterdam, Zonen, Seal

Dutch, Rotterdam, Zonen, Seal, Image & Found by John Los.
Found near Amsterdam, 18mm, 7.6g.

Pierced mullet 4 long 4 short arms, R(O)TTE(RDA)M around // & / ZONEN / -.- / 6 pointed star, ...E...ER around

Guessed to be Rotterdam. No product, company or organisation has yet been associated with this seal.

Cleve & Zonen are a possibility.