If you are referring to a 1952 USA Chevrolet truck (which the year of the 6VWC 1601 Vehicle Number), there was no paint and/or trim code placed anywhere on a tag on the truck that year. Does not matter what size truck you have.

6VWC 1601
6 = Oakland
VW = 1952 6400 series
C = March
1601 = 601th 6400 series truck produced at that plant that year (1601-1000)

If you are referring to the Vehicle Serial Number plate (upper right on this page), 6VWC 1601 was the only code originally put on that tag. The other code might be an attempt to put an engine code on that tag (for a replacement engine?).

Can you post a photo of your tag? Or, mail a photo to me and I will post it here lederman@siena.edu.