Great, that's the body tag!

A little body tag information. Ford did not make the Mark II bodies. They were made by the Mitchell-Bentley Corporation of Owosso, Michigan. Initially there were two different Mark II bodies, the A/C version and the non-A/C version. The A/C version received the body tag. To my knowledge no one has figured out the logic of the numbers, but the AC is obvious.

Also, the body tags were body color. Regarding colors - things that were on the car bodies when they arrived at the Continental plant were painted body color. Things that were added to the car body at the Continental plant were painted black. Of course that does not include the engine, transmission, chrome, etc.