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Bertus Sondaar was a master of portraiture, mostly in bronze. This chamotte sculpture hung in his studio (see photos). In book: a portrait of Sondaar, p. 19).
I showed the sculpture in the exhibition of Bertus Sondaar (see photos). This exhibition was put together by his daughter-in-law.
As far as I know, 5 portraits of Yvonne were made in chamotte, one copy was sold at art dealer Pygmalion for between €1000 and €5000.
Centraal Museum in Utrecht also owns a copy.