Patek Philippe equipped reference 5101 with its manufacture calibre 28-20/222, which combines two rare complications within a limited physical space. The energy for the 10-day power reserve is stored in two mainspring barrels, which can be fully wound by approximately 100 turns of the crown. A coupling system prevents overtightening of the mainspring and disengages the barrels when they have reached their winding limit. The second complication is a one-minute tourbillon carriage comprising of 72 individual components and weighing only 0.3 grams. Tucked-away underneath the classic salmon dial, it can be admired through the sapphire crystal display back which reveals the sophisticated carriage alongside the meticulously decorated plate and bridges.
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