Having linked with other moho expert, I quickly figured out it is a 1979 body, on a 1981 chassis! Could this be? All signals point to a 1981 model: Title, all papertrail, stickers on the windshield, PO etc... However when Carfax got a hold of the 13 digit number it kicked out "too old" pre-1981. The second 17 digit body number did however kicked out 1981 Chevrolet chassis.
How odd for a coach's vin clearly make it a '79, yet the chassis make it an '81.
Could this be the case?