102 22 P 1626 ?
Is that what you read?

102 = 1/2 ton longbed
22 = 228 engine
P = Pontiac Michigan plant
1626 = 626th 1/2 ton off that assembly line in that year

I could be wrong with this decoding - I trust someone will confirm/correct.
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Last edited by tclederman; 04/25/2020 5:23 PM. Reason: added jpeg image