Up to ten additional phases are needed to produce the folding models.Each example is made in its entirety and then carefully broken at three points, on both sides and the bridge.
The bridge: Housings are created in the upper and lower parts to accommodate the hinges. The folding areas are then filed smooth for maximum comfort.
The Sides: After fitting a core, the hinge is applied and the sides then go through the finishing process.
In order to ensure a perfect fold, the nose pieces are slightly different to those of other Persol models.