A stamp of his ring can be found in the archives of Arnhem. The coat of arms of Johan Joseph. Since Johan Joseph had no children, his ring was probably heritated by Gerret Willem Christiaan, the son of his brother Willem Christiaan . Gerret Willem was a chemist in The Hague. Gerret Willem van Dort was granted permission by the king to call himself van Dort-Kroon.
Kroon is Dutch for crown.
Hence his children are all called van Dort-Kroon. The seal of Gerret Willem Christiaan van Dort-Kroon. Twice the real size. A man carrying a stick with a bundle on the end. Today I originate from the family from Bergen op Zoom.