77/ 549 Zwart, P. [N.K.F.]. "?60 50? 60kM 50kV-kabel geleverd en in bedrijf (...)". Advertisement, 1928, 29,9x20,9 cm., recto w. letterpress text, verso blank, tipped onto brown paper mount at corners.

- Trifle wrinkled at corners.

= Dated "1928" in pencil by Piet Zwart on verso mount and "7.3.28" in pencil by Kees Broos. PROOF.

Variant printed in black only of the extra leaf that was inserted in the NKF catalogue published in 1928; cf. Coll. Marius Wagner no.775; see also lot no.561.