Header I.D.
 

Thinking about selling a set of N.O.S. headers I think are Appliance brand and need a positive I.D. I found the #26 on a tube down by the square flange collector. I got these with a 73 Corvette project in the early eightys and they have been mounted on a small block Chev. In my showroom since 1985. Any help with an I.D. and value would be greatly appreciated! Thanks