Nul ephmera, three curious items

(1) Piece of white cloth, coarsely cut to 100 x 8.5 cm, stamped 'nul=0' in black ink. Undated. Unknown function but possibly used in a Zero happening as a sash or headband. (2) Gold coated matchbox, 5 x 4 x 0.7 cm, printed 'armando henderikse henk peeters schoonhoven'. Interior holds 20 matches, a printed 'O' and the text 'Close Cover Before Striking.' Undated.

(3) Groep Nul= O, New Years greetings 1966. Harmonica sheet with die cut hole, 6 x 6 cm, folds out to 30 x 6 cm. White paper with black text on recto, silver paper on verso. Text reads 'group O =nul, meilleurs voeux, best wishes, auguri, 't beste, 1966'. Signed in print by Armando, Henk Peeters and J.J. Schoonhoven. Some age toning, else a fine and rare copy. (total 3)