Isaac van Collem was ill and died in his own bed. He lies buried on Muiderberg.
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Isaac van Collem was married. He lived with his wife at 42 Nieuwe Herengracht 42, third floor, in Amsterdam. In April 1942, Het Joodsche Weekblad published an obituary for Isaac van Collem.
Amsterdam municipal archive, Records Jokos, Möbel-claim 489, property Joods Maatschappelijk Werk;
Het Joodsche Weekblad, 1 April 1942, 8