56 buick century riviera, need help with CTC paint code

[stuartls]

Thanks for having this forum guys. I personally appreciate it. HOWEVER my buddy Bob, old and set in his ways wants to figure out what the Buick Century we just pulled out of a shed and into a brand new garage had as original paint. Paint no is "CTC", and rather than waist your time i have tried to research this before coming here. The car has 39,000 miles on it and he is going to do a restoration. Trim no. is 623. model number is 56-63 and at the end of that sequence is what looks like a "1" with a "D" around it, can any one help and/or give me a link to further clarification?

Thanks in advance guys and girls!

Stu

[Straight Eight]

Looks like the 1955 code for Gulf Turquoise on the top and bottom and Cameo Beige in the middle. Are these colors on it now?