I have not seen codes for the paint used on 1952 painted hubcaps. In 1953, the painted hubcaps were Thistle Gray and the bumper was Anvil Gray.
I think that Jim Carter is incorrect about the color of the hub caps he is selling (at one of Bill's link). Since the bumpers were Anvil Gray and the hubcaps and inner grill were Thistle Gray (in 1953 and I'd bet in 1952).
The standard hubcaps were painted in 1954 - Thistle Gray (bumpers again Anvil Gray). Chrome hubcaps were optional in 1954 (and had different markings than in earlier years).
