I think this sign is from the mid 1980's. It has some discoloration in the blue of the lower left corner and a 5/8" crease at the top left corner (the pencils are pointing to the described area). There are some stains in the black around the plate (tried to show it in the photo). The stains do not show with a light from behind, but the discoloration does show. No cracks. Made of a flexible hard plastic. This is a nice sign that doesn't come up for sale very often.