Hi, I'm new to this forum, I have a Dupont paint sign that I was wanting to get some information on it. Its double sided measures 36'' wide and 29 '' tall all yellow with black and red lettering, it reads from top to bottom EXPERT BODY REPAIR AUTO PAINTING DU PONT LUCITE - DUCO - DULUX AUTOMOTIVE FINISHING. my brother pick it up at a shop he worked in back in 1974. was wondering when it came out and maybe the value of it. Thanks