That's the slogan from the esso oil drops. The Esso figures are some of my favorite ad characters. The male oil drop is named Happy but I am not sure what his girls name is. This image is off an oil tin in my collection. They appeared on all sorts of maps, containers and booklets plus many figural piece like Key chains and small vinyl figures to name a few. Seems most gas and oil company's have abandoned their beloved pitchmen for animated cars and swimming fish these days. So have a Happy day for Mr and Mrs Esso.