The marriage on http://www.genlias.nl/en/page0.jsp
shows that he was the widower of Margaretha Jozina van Dam.
His previous marriage was on 4 august 1841, register 4, folio 84v with Margareta Jozina van Dam, age 27, born in Den Helder. It shows that his father Daniël Gundelach is a blacksmith.
He married a 3rd time on 14 May 1873, reg. 5 fol 29 to Dorothea Bres, age 46, born in Amsterdam. See the 3 attachments.
I find him 3 times in our continuous census of the period 1874-1893 Seehttps://stadsarchief.amsterdam.nl/english/archives_database/...
To see the real data I need to spend money or visit the archive.