Oswald. Illgner, Franz — Harmoniezoeker Type C.
jpg Doorn,, H. van Gimborn, Openslaande kartonnen kaart met aan binnenzijde 6 draaischijven. Form. 24 x 34 cm., Ned. tekst. Ostwald's " Harmonious Colour-Seeker Type C ". Dutch text.In the form of a set of dials attached to boards, each dial being divided into 24 hue areas. Condition: Some small notes written in ink. See picture. Rare.
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Bognummer:
C11424
€250.00 ($275.55 | £208.57 | ¥44,001)