The Baptismal and Marriage Records of Rev John Waldschmidt, 1752-1786say:
"Gundel - Maria Magdalena, d of David Gundel, decd., and WilhelmSchack, s of Michael Schack." There is no date.
Lancaster Co Heritage copied from PA archives:
"Schack - Gunde
Wilhelm Schack, s of Michale Schack, and Maria Magdalena, d of thedecd . David Gunde; Apr. 21, 1755."
PA Marriage Records, 1700-1821:
Name: Wilhelm Schack
Marriage Date: 21 Apr 1755
Marriage Place: Lancaster, Pennsylvania
Father's name: Michael Schack
Spouse's Name: Maria Magdalena
Spous's Father's Name: David Gunde