This is a new aftermarket replacement for the VT500 IGNITION CONTROL (CDI) which has been discontinued by Honda.
The original ignition number may have been stamped on it AKBZ46, MF5, 131100-4500. 12v, MF5 ( The orginal part is show in the photo below, the new part is the orange unit)
The new replacement ignition unit larger and will mount differently than the original part.
This unit has some improvements over the stock unit: