I would imagine whatever follws "MC16E-*********" could be matched up to the relevant bikes. Im sure theres a list somewhere with engine numbers that were assigned to a particular model, just as the frame numbers were!
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NSR250R MC21 (NEARLY SOLD!!)
VFR400R NC30 (SOLD)
Santa, please bring me a NSR500 and a SP-2 next year. Pleeeeease....