This index tracks ultra-high-end mechanical masterpieces combining perpetual calendars, minute repeaters, and tourbillons from Patek Philippe Sky Moon Tourbillon, VC Les Cabinotiers, Lange Grand Complications, JLC Master Grande Tradition, and AP Jules Audemars. It measures apex horological achievement appreciation. Use this a critical indicator for ultimate collecting tier, technical mastery recognition, and seven-figure timepiece investment performance.
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