This is a vintage Chicago Cubs glass decal for mounting on the inside of a piece of glass or it can be mounted on wood, plastic or metal surfaces.  It was made by J.G. Barron Decal Company in Chicago.  The phone number is Andover 3 - 4437, before the standard use of only numbers was implemented.  This is from my personal collection and I would guess it is from the late 1960s.  There is a little mark on the backside that doesn't impact anything.  It is sold as is.