SAFEPOST/KUK FELDPOST/JOCKPOST. 1961.

NYC: s.p. (Watts), 1961
11.5 x 14cm, green on white adhesive cinderella postage stamps with perforations. A complete sheet with margins of this the second ever complete sheet of artist designed stamps to be released as an art object. Very good. Ref: Silverman nr 476. Very rare.