Christie’s charges a premium to the buyer on the Hammer Price of each lot sold at the following rates: 29.75% of the Hammer Price of each lot up to and including €20,000, plus 23.8% of the Hammer Price between €20,001 and €800.000, plus 14.28% of any amount in excess of €800.000. Buyer’s premium is calculated on the basis of each lot individually.
S. den Heijer and M. van der Knaap, Aarde in verf. Jaap Wagemaker schilder van het elementaire 1906-1972, Zwolle 1995, p. 135 no. SO.36-001 (ill.) and ill. in colour on p. 29.