"Zombies - They were your friends" Metal Button Badge as they are referred to on the "What material you'll receive" page of the PIC Publicity Press Kit supplement. "These have been specially produced and limited numbers will be despatched to theaters".
37 mm
From my personal collection.
(Click on the pictures to review them in their native resolution.)
To quote this article
Danny Duchesneau@2023, "Dawn of the Dead Metal Button Badge issued in the UK by Target International in 1980", Dawn of the Dead Collector's Blog, published on 23 April 2023.