Henri Mozes Son was known as Harry Son, first cellist of the Budapest string quartet, which existed from 1917-1967. He left the quartet after a conflict in 1930. Through Palestine he returned to the Netherlands shortly before the war. A picture of the quartet can be found on the following website
Addition of a visitor of the website
In addition, a Jokos file (number 55317) on this person 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 valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 11183/12258).