{"query": "1205SP", "brand": null, "total": 1, "limit": 10, "matches": [{"slug": "zenith-1205sp", "brand": "Zenith", "ref": "1205SP", "model": "El Primero Prototype", "case_material": "Stainless Steel", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/zenith-1205sp", "description": "The Zenith El Primero Prototype 1205SP is a pre-production chronograph manufactured between 1967 and 1969 during the development of the caliber 3019 PHC. Collectors prioritize this reference because it represents the earliest physical implementation of the high-frequency integrated automatic chronograph movement. The 1205SP features a 37mm stainless steel case with a screw-down caseback and a distinctive silver sunburst dial characterized by a date window at the 4:30 position and a lack of the \"El Primero\" branding found on later production models like the A384. Due to its status as a developmental prototype, production was limited to a small number of units, making it significantly rarer than standard production references. On the secondary market, these prototypes typically command prices in the mid-to-high five-figure range. A notable example sold at a 2019 Phillips auction for approximately 75,000 CHF, highlighting its historical importance as a functional testbed for the movement.", "score": 201}]}