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A notable production variant is the \"Mark 4\" dial, which features polished steel hour markers with luminous inserts. These watches are frequently found with \"Gay Frères\" beads-of-rice bracelets, which significantly impact the final valuation for collectors."}, "listing_stats": {"count": 16, "median": 7325.0, "low": 3500.0, "high": 45000.0, "brands": 1, "merchants": 3}, "listings": [{"id": "h_7645446144109", "title": "Heuer 1960s Heuer Autavia (Ref. 2446) First Execution Case W/ Mk. II Dial", "brand": "Heuer", "model": "1960s Heuer Autavia (Ref. 2446) First Execution Case W/ Mk. 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"case_material": "Stainless Steel", "hammer_usd": 7500, "year_sold": 2019, "venue": "Christie's New York", "lot_summary": "An early execution of the compressor-case Autavia, featuring the Valjoux 72 movement and a black dial with white registers.", "source_url": "https://www.christies.com/lot/lot-6214550", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/heuer-2446c-2019"}]}