This Sanrio Bunny and Matty child-size ceramic mug is only 2.5 inches tall. It's dated 1976. The front looks to me like a pilot theme with Bunny and Matty wearing goggles and a parachute (but also a raincoat, rain hat, and boots).
But on the back, Matty is sitting in a cloud trying to catch a baseball:
Who said cute had to make sense? Hop two!