These are a pair of special front hub nuts for mounting shock absorbers, designed for all drum hub models.
These amazing nuts were initially designed and sold by the Italian company Omega in the 70's. They advertised these to fit all Series 1, 2, 3 GP DL, J range and Lui / Vega / Cometa models. However, we have also fitted these to early open-frame models as well. Basically they will fit all models that have a DRUM type front brake!
We have had these remade and in the pics you can see how they look when fitted to a Luna Line Lambretta. The purchase price is for a pair of nuts.