Maxon (Nisshin Onpa) prototype for Super 70 1972 Gold

The humbuckers that I sell are prototype for Super 70 pickups. They are manufectured in 1972 june 19, according to the 12619 serial number. Nisshin Onpa has manufactured pickups for Aria, Ibanez and Greco guitars. Ibanez and Greco Nisshin Onpa (Maxon) pickup serial number format consisting of 5 numbers up to and including 1977. Ibanez Super 70 pickups have the same serial number format. First number = Nisshin Onpa (Maxon) pickup code (1, 2, etc.) Second number = Year (7=1977) Third number = Month (0=Jan ... 9=Oct then .=Nov, X=Dec) Fourth and Fifth number = Day of Month (01-31)