This index monitors perpetual and annual calendar complications from Patek Philippe 5140/5327, VC Patrimony, AP Royal Oak, Lange Langematik, JLC Master Perpetual, and IWC Portuguese. It tracks appreciation for mechanical calendar computers displaying day, date, month, year, moon phases, and leap year cycles. Use this index as a key indicator for intellectual complication preference, mechanical computer fascination, and long-term calendar functionality desirability.
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