The one sheet is part of the accessories of the United Artists press sheet.
71 x 102 cm
From my personal collection.
(Click on the pictures to review them in their native resolution.)
To quote this article
Danny Duchesneau@2022, "Dawn of the Dead One Sheet Poster issued in Australia by distributor United Artists in 1980", Dawn of the Dead Collector's Blog, published on 15 February 2022.