Brake shoe cam for the front fork of the very early Vespa models with large frame but still 8 inch tires. Is stored directly in the aluminium of the brake anchor plate, i.e. a touch of ceramic paste or heat-resistant grease is advantageous here to prevent the bolt from seizing in the aluminium in the long run.
For completion a split pin and, if no longer available, a set of clamping plates is required for tension fixing.