single-sided c. 1950's vintage american industrial "down time is clean up time" informational sign possibly fabricated by the ready-made sign company, new york city, ny. the single-sided factory sign is comprised of heavy gauge galvanized steel with a clear vinyl or laminate surface. the original steel grommets are intact. the brightly colored yellow lettering against a green background remains vibrant, despite surface wear. measures approximately 10 x 7 inches.