{"query": "2447NT", "brand": null, "total": 1, "limit": 10, "matches": [{"slug": "heuer-carrera-2447nt-vintage-chronograph", "brand": "Heuer", "ref": "2447NT", "model": "Carrera 12 Chronograph", "case_material": "Stainless Steel", "url": "https://mostexpensivewatches.net/reference/heuer-carrera-2447nt-vintage-chronograph", "description": "The Heuer Carrera reference 2447NT was produced between approximately 1963 and 1970. This specific execution is distinguished by its three-register \"Noir Tachymeter\" configuration, featuring a matte black dial with a white outer tachymeter scale. Collectors prioritize this reference for its 36mm stainless steel case with sharp, faceted lugs and the manual-wind Valjoux 72 movement, a column-wheel caliber noted for its reliability and historical significance. The 2447NT is rarer than the standard silver-dial 2447S or black-dial 2447N due to the added functional scale. On the secondary market, prices typically range from $15,000 to $30,000 depending on the presence of original tritium lume and case sharpness. A notable production detail is the transition from \"Swiss\" only to \"T Swiss\" markings on the dial, which indicates the shift from radium to tritium luminous material during the mid-1960s.", "score": 201}]}