76/ 720 Zwart, P. [N.K.F.]. "50 k.v. N.K.F.-kabel 25 k.v.a in het kleinste bestek. Minimale extra verliezen (...)". Advertisement, 1930, 30,9x13,7 cm. (leaf), recto w. letterpress text, verso blank.

- Very sm. tear in blank left margin; verso dated "9.7.30" in pencil.

= PROOF. PZ-180; Monguzzi p.70.