Vespa Super VBC,Sprint,VBB Halogen Headlight Bulb 6v.

 6volt 25/25watt BA20d Halogen headlamp bulb with 20mm Bosch bayonet base and clear glass. The Halogen filled bulb offers a brighter whiter light than a standard bulb, only suitable for use in glass headlamps or headlamps designed for a Halogen bulb. (also called S2 or 395)