= With crossed out earlier versions of the title on verso, i.a. "vertikaal zwart". Provenance: the collection of G. Hofland.
- With vague horizontal fold.
= Possibly used as new year's wish, w. the original envelope mounted on verso of frame.
= Possibly used as new year's wish, w. the original envelope mounted on verso of frame.
= This lot is subject to 4% resale royalties ('droit de suite') over the total amount of hammerprice and buyer's premium. SEE ILLUSTRATION PLATE IV.
= Title and "5 Januari 1974" supplied in ballpoint in a diff. hand on verso frame.
- Vertical fold and some creases; num. tears closed with tape on verso.
= With attribution by Wim Feltkamp (the artist's nephew) on verso: "Studie v. eigen kop [illegible] door mijn oom H.P. Bremmer. W.C. Feltkamp".
= Kersten 74 and p.16.
= Kersten 73, the 2nd state (of 2).
- Sl. foxed, mainly in blank margins. = Kersten 111.