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On the secondary market, these watches typically trade between $5,000 and $9,000 depending on dial configuration and mechanical condition. A notable variant is the 3647T, which features a red tachymeter scale on the outer track, often commanding a premium over the standard silver or black \"D\" decimal dial versions due to its lower production volume."}, "listing_stats": {"count": 33, "median": 5900.0, "low": 3650.0, "high": 13900.0, "brands": 2, "merchants": 4}, "listings": [{"id": "h_8129444348013", "title": "Heuer 1960s Heuer Carrera 12 '2nd Execution' (Ref. 2447D) Silver Decimal Dial", "brand": "Heuer", "model": "1960s Heuer Carrera 12 '2nd Execution' (Ref. 2447D) Silver Decimal Dial", "reference": "2447D", "price_usd": 10000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": ["Chronograph"], "merchant_slug": "craft-and-tailored", "merchant_name": "Craft + Tailored", "image_url": "https://cdn.shopify.com/s/files/1/1104/9180/files/Img044335.jpg?v=1781917652", "detail_url": 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