Jan Sakes Hamstra
- Born: 16 Dec 1830, Achtkarspelen Friesland Netherlands
- Marriage: Dieuwke van Dekken 26 Jul 1856, Achtkarspelen Friesland Netherlands
- Died: 5 Apr 1910, Achtkarspelen Friesland Netherlands
Jan married Dieuwke van Dekken, daughter of Jille Gerkes van Dekken and Hinke Sikkes Pitstra, on 26 Jul 1856 in Achtkarspelen Friesland Netherlands. (Dieuwke van Dekken was born on 6 Jan 1834 in Achtkarspelen Friesland Netherlands and died on 17 Nov 1913 in Achtkarspelen Friesland Netherlands.)
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