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Reset for 939series trucks came in two flavors -
1) RSMS, which was essentially a frame off restoration to as new condition (more or less)
2) IROAN, which was "inspect, replace only as needed".
Data plates which were damaged or faded frequently got replaced. Vehicle serial numbers were...
My guess is it went through reset and got a new data plate then. Frequently they didn't get date stamped.
Best guess says the engine is original to the truck.