Coin made in honor of Johann[es] Heineken.  The coin reads:

     "Johann Heineken, born 26 Oct 1761, Professor of Physics and Doctor of Medicine, 16 Aug 1783"

     This would indicate that Johannes was only 21 when he had a Medical degree.  The relief of him is of a much older Johannes, believed
     to have been made when he was 50 years old.  It is believed the coin was given to him as a present on his 50th birthday.
 
     (Johannes was the grandfather of C.A. Heineken of Mill Park.)