Your Casa Lambretta Specialist Dealer
This mentally rare accessory was made the Italian company Zeca.
It's for Model C Lambretta's (that initially were sold without a number plate as they were not obligatory by Italian law at the time) and can be flipped up out of the way for rear wheel changes / general access. The accessory has a small, neat leaf spring to keep it locked in either the 'up' or 'down' position and internal hooks for the wiring to attach to. You don't get madder than this....