Constant
1966 Collection Hollander, NY, USA [bought at Biennal Venice]
Collection Benjamin D. Bernstein, Philadelphia, USA
Collection Tom Okker, NL [in the eighties, acquired from B. D. Bernstein]
2021 Simonis&Buunk, NL [bought at online-auction Christie's Lot 45 "Made in Holland]
2023 unknown collection (Simonis&Buunk Kunsthandel, Ede)