VIN breakdown and something's out of whack !

[RSRXION]

OK guys here's my dilemma.

I bought my hauler after being told it was a 72. A good friend who has 20 plus years of building these trucks under his belt said "nope , it's a 71". He showed me where the rear view mirror had been mounted on the roof interior indicative of the 71's. As we all know the 72's had a windshield mounted mirror. He also pointed out the lack of the screw dimples on the door interiors. 72's had these dimples while 71 back did not. BUT THEN .... I enter the VIN of the truck on the decoder and it comes back as a 72. The title also says 72.

It isn't a real early VIN sequence number so it is very unlikely that they used "leftover " parts to build this truck. As far as I can tell the doors are original to the truck and there is absolutely no mistaking the mirror mount on the cab interior roof. Any ideas on what gives here ?

Incidentally , this unit was a cab and chassis originally I believe and according to the data plate on the drivers side door jamb it's maximum GVW is 14,000 pounds. I also noticed that the cab lights have their own little raised "towers" built right into the factory roof. Would the fact that it's a 1 ton have anything to do with this ?

The VIN is CCE332S166XXX

Thanks, Dean