Tail light

The taillight on the Bicizeta is a model CEV 9312 - there is two version of this tail light (Fanalino Posteriore in Italian), one with a clear base and one with a black base. The base is soft plastic that molds to the fender to act as gasket. The version on the Bicizeta is the clear one. I found one in Italy NOS here it is broken down:

This one will find its place on the bike shortly