Single-sided advertising press sheet. I got this yesterday from a collector based in Edmonton, Canada. It was placed inside a mint Pressbook, which was placed inside a mint Advertising Press Sheet Style A. I have never seen this item before. I wouldn't be surprised if these were issued specifically for Canadian exhibitors.
25.3 x 34.4 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 Advertising Press Sheet issued in the US by distributor United Film Distribution Company in 1979", Dawn of the Dead Collector's Blog, published on 29 March 2022.