Before the war Isaac Konstenaar had a butcher shop on the corner of the Hofmeyerstraat and the Tugalaweg. His wife Esther Engelschman assisted him. Addition of a visitor of the website.
In addition, Jokos files (numbers 51914, 51913) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.