Reference:Movements: Difference between revisions

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The early Oyster chronograph references use Valjoux ébauches, with Rolex caliber designations that should be kept distinct from the maker’s base number. Available auction records support a limited Cal. 13 / Valjoux 23-family entry. Ebauches S.A.'s 1951 technical guide labels a two-pusher, 13-ligne movement “VZ 23” ([https://myretrowatches.co.uk/wp-content/uploads/2024/09/Valjoux-VZ-23-Technical-Guide.pdf technical guide, 2nd edition March 1953]). That nomenclature does not establish Rolex fitment. The Cal. 13 evidence discussed here concerns the 3525 and does not identify every early Rolex chronograph movement.

For ref. [[Reference:2057|2057]], Phillips describes a manual movement. The 2026 FutureGrail catalogue transcription attributes a 13-ligne Valjoux base by Reymond Frères and 17 jewels; its photograph shows the Rolex signature and jewel count, while the caliber and maker remain unreadable. Treat this as a lot attribution, not a confirmed caliber assignment.

Ref. [[Reference:2021|2021]] is a pre-Oyster monopusher. Published descriptions give movement sizes from 13 to 16½ lignes; Uhrenkosmos names a Valjoux VZ in one early monopusher, while auction catalogues describe different executions. The available records do not support a reference-wide caliber assignment. Keep these descriptions separate from the Cal. 13 entry below. [https://www.uhrenkosmos.com/rolex-daytona-seine-technik-und-geschichte/ Uhrenkosmos, early monopusher movement] [https://www.phillips.com/detail/rolex/115419 Phillips, case 12'010] [https://www.cambiaste.com/it/asta-0795/rolex---rarissimo-cronografo-due-contatori-da-polso-monopulsante-in-ac-270066 Cambi, steel case 14xxx]

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 The early Oyster chronograph references use Valjoux ébauches, with Rolex caliber designations that should be kept distinct from the maker’s base number. Available auction records support a limited Cal. 13 / Valjoux 23-family entry. Ebauches S.A.'s 1951 technical guide labels a two-pusher, 13-ligne movement “VZ 23” ([https://myretrowatches.co.uk/wp-content/uploads/2024/09/Valjoux-VZ-23-Technical-Guide.pdf technical guide, 2nd edition March 1953]). That nomenclature does not establish Rolex fitment. The Cal. 13 evidence discussed here concerns the 3525 and does not identify every early Rolex chronograph movement.
+For ref. [[Reference:2057|2057]], Phillips describes a manual movement. The 2026 FutureGrail catalogue transcription attributes a 13-ligne Valjoux base by Reymond Frères and 17 jewels; its photograph shows the Rolex signature and jewel count, while the caliber and maker remain unreadable. Treat this as a lot attribution, not a confirmed caliber assignment.
 Ref. [[Reference:2021|2021]] is a pre-Oyster monopusher. Published descriptions give movement sizes from 13 to 16½ lignes; Uhrenkosmos names a Valjoux VZ in one early monopusher, while auction catalogues describe different executions. The available records do not support a reference-wide caliber assignment. Keep these descriptions separate from the Cal. 13 entry below. [https://www.uhrenkosmos.com/rolex-daytona-seine-technik-und-geschichte/ Uhrenkosmos, early monopusher movement] [https://www.phillips.com/detail/rolex/115419 Phillips, case 12'010] [https://www.cambiaste.com/it/asta-0795/rolex---rarissimo-cronografo-due-contatori-da-polso-monopulsante-in-ac-270066 Cambi, steel case 14xxx]