What is the code on the ID plate riveted onto the cab's door frame between the hinges? That should ID the year.

The grill on your truck is painted white (all over) like the 1955-1st series grill (image is attached below). The 1954 grills were painted differently. Most likely

Transport Blue was used from 1953 through 1955 first series.
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1954 4103TransportBlue.jpg (31.39 KB, 108 downloads)