A cleaning contractor in Scunthorpe found a Mars Bar with a 1991 best-before date while clearing a hoarder's house, weighing 62.5g compared to today's 40g bar.
Victoria Gordon, who runs Pocket Rockets, posted photos comparing the vintage bar to a modern one and the post went viral, with Gordon joking she might take it on a UK tour.
Mars said it has made 'a number of updates' to bar sizes over 35 years, citing consumer demand, manufacturing costs and cocoa prices.
The full dispatch is available from the source below.