This is a Great plastic pin features a very happy Mickey Mouse, facing right, running with a pair of suitcases. He is dressed in 1940s or 1950s outfit with red jacket and tie, yellow pants and shoes and a white straw hat with red band. He wears a button on his coat that says "HI!" and the suitcases are brown.
As with most plastic pins, this one has an old-style clasp on the back, with glue visible (as is normal for that era).