76/ 722 Zwart, P. [N.K.F.]. "±6000 uren. Vanaf eind Mei 1924 tot nù (Febr. 1925) is een proefinstallatie met 50000 V éénphasekabel in vol bedrijf (...)". Advertisement, 1925, 29,8x12 cm. (leaf), recto w. letterpress text, verso blank, tipped onto grey paper mount along upper and lower margin.

- Horizontal middle fold; dated "11.2.25" in pencil on verso mount.

= Dated "1925" by Piet Zwart in pencil and with his mounted address ticket "Piet Zwart architect Rijksstraatweg 290 Wassenaar" (0,7x10,2 cm., printed in red) in lower corner on recto; SIGNED and "1925" in pencil on verso of mount. PROOF. PZ-167.