RILEY, Bridget. Bridget Riley.

(Dusseldorf, Germany): Stadtische Kuntshalle, 1971.  First edition.  Gallery invite.  Scarce invite for the opening of the first retrospective exhibition (covering the period from 1961 to 1970) at Stadtische Kuntshalle, Dusseldorf, March 12 – April 11, 1971 (the exhibition first opened at opened at the Kunstverein Hannover).  The invite measures 10.5cm by 42cm folded to 10.5cm to 21cm.  A very good example.