Transparency is a big thing in watchmaking these days and you probably won’t find anything bigger than this exceptional watch by the brand 4N. Housed in a totally transparent sapphire crystal case, the amazing mechanical manual-winding movement that powers the jumping hours and minutes is exposed in all its glory. Composed of 514 components, most of which you can see through different angles on the sapphire case, the complexity of the movement will take your breath away. Both the jumping hours and minutes are read off in a digital display on a series of overlapping discs and, in the case of this model, are highlighted in bold, bright orange to enhance legibility. Thanks to the double barrels in the movement, the power reserve of this watch is close to 10 days and the crown and pusher are made in white gold. A limited edition of just three pieces, you can customise the colours of the numerals to guarantee an intense and very personal viewing experience (€280,000).