Hijman Slap was counted among the so-called ‘diamond men’. These men, to which also his father Elias, his nephew Hijman Slap and son Gerrit belonged, had turned in a lot of diamonds to get a sperre. Because the diamond industry had to go on, first only the women and children were sent to Westerbork …
In addition, a Jokos file (number 14928) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for looted jewellery (S-claim, number 20/52).