I have been looking at 57 Chevy's lately.
I had a cherry 210 two door sedan in hs, Tropical Turquoise with white top and white side panel.
Been looking at color codes on this site:
http://www.bestintexas.com/cars/57codes.htm
The codes are all three digit numbers for both the single tone and two tone paint.
However, every tag I look at has a 3 digit number followed by a letter or letters.
What are the letters for?
Asked for a pic of one on ebay and received this tag pic: