This index monitors purpose-built professional timepieces including Rolex Submariner (diving), GMT-Master (aviation), Explorer (exploration), Omega Speedmaster (space), Breitling Navitimer (aviation), IWC Pilot's watches, Sinn professional series, Doxa SUB diving, and Seiko professional diving. It tracks appreciation for authentic tool heritage, functional design, and professional use history. Use this a key indicator for tool watch segment, authenticity value, and functional luxury appreciation over pure aesthetics.
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