1778 -He was a witness for the marriage of his son Salomon Levie . DTB 750-382.

http://shum.huji.ac.il/~dutchjew/genealog/ashkenazi/index.htm
Levie Benjamin Wolf Gans, birth 1723 in Enkhuizen,
Died 14 Dec 1795 in Amsterdam, buried Zeeburg cemetery.
Married 4 May 1747 in Amsterdam, son of Benjamin Wolf Salomon Gans and unnamed, DTB 729/105.
Witness for the groom, father Benjamin Salomon Gans
Witness for the bride, father Marcus Mozes Levie
Married to Judith Marcus Levie, born 1728 Amsterdam, died 13 May 1798 in Amsterdam, buried Zeeburg cemetery, widow of Levie Wolf Gans.