This was an NOS heater control valve I bought about 15 years ago and put on my 66. It was in a GM box when I got it. I had it on my car until recently when I found the correct valve for a 66. Not sure exactly which years this is correct for, but it is not visually correct for a 65-66 model even though it fits and functions just fine. The plating on it still looks new other than under where the hoses will cover, which does not matter. I made the nut on the lathe to hold it into the bracket (odd thread pitch).
Perfect for a driver GS or one not going through 400 point judging. $25 plus $13.45 shipping in a USPS Flat Rate box. I have paypal.