"Zombie" diapositive or more precisely diapositiv, as they are referred to in the Neue Constantin Film campaign manual. Material intended to exhibitors. Large diapositive used for onscreen advertising in cinemas.
8.4 x 8.4 cm
From my personal collection.
(Click on the pictures to review them in their native resolution.)
To quote this article
Danny Duchesneau@2021, "Dawn of the Dead Diapositive issued in Germany by distributor Neue Constantin Film in 1979", Dawn of the Dead Collector's Blog, published on 17 December 2021.