Mars

'I would't give you tuppence for anything but Mars.' A centre made of fresh eggs, malted milk and butter - covered with a coating of delicious creamy milk chocolate, made with plenty of milk straight from British dairies... that's Mars' nourishment - and that's Mars' NICENESS! Never was sheer goodness made so irresistible!
Source: The Picturegoer Weekly. April 10, 1937.