The frame # might be more help. On the back cover of the Vulcan service manual is a list of VIN #'s for each year.
If the engine # should be the same as the frame #, the number you give isn't listed.
It shows European Vulcans starting with VN750A-002501 (1986)
AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC