Stucknut,
Welcome to Stovebolt.com
Presumably, you are referring to the Vehicle code on a metal tag attached to the cab between the driver's side door hinges?
Pretty good job on the decode:
14JP-L 1968
14 = Baltimore
JP = 3100 (1/2 ton) JR is 3600
L = December
1968 = 968th 3100 off the line in that plant in 1951
Last edited by cletis; 05/22/2013 1:34 PM. Reason: deleted personal message