Vintage 1972 JAPAN KING SEIKO CHRONOMETER SP WEEKDATER 5246-6000 25J Automatic.

Vintage 1972 JAPAN KING SEIKO CHRONOMETER SPECIAL WEEKDATER 5246-6000 25Jewels Automatic.

Welcome to my auction!
I am Japanese who live in Tokyo.

Item description

Movement :

• Pet name : 52 KING SEIKO CHRONOMETER SPECIAL WEEKDATER .
• Caliber number : 5246A.
• Movement : Automatic.
• Beat rate : 28800bph.
• Year of manufacture start : 1971's.
• Factory : Kameido.

Externals :

• Serial number : 281926.
• Dial number : JAPAN 5246-6000R.
• Glass : Crystal.
• Case size : About 35.2mm.
• Lug width : 18mm.
• Band : New Leather Strap of SEIKO original.

Condition :

• Used, it runs well.
• Quick set(Day/Date) : Okay.
  Set the day of the week can be in English or Japanese.
  Set of the date : The set at one stage pulling the crown.
• The day difference time of an used watch is about +-1 minute / day.
• For practical, everyday use, it would be advisable to have the movement cleaned and oiled.

Key Features

The Sovereign Apex of 1972 Kameido Chronometry (1972): Manufactured in **1972**—a milestone historical year during Daini Seikosha's peak mechanical competition era—the **King Seiko Chronometer Special Weekdater (52KS)** represented the pinnacle of high-grade automatic horology. Sourced under reference **5246-6000**, this ultra-rare ""Special Chronometer"" model sat at the very apex of the King Seiko hierarchy, officially certified to strict internal chronometer standards to challenge top-tier Swiss luxury timepieces.

The Legendary High-Beat 25-Jewel Caliber 5246 Heart: Powering this historic instrument is the revered **25-jewel Caliber 5246A**, an in-house automatic engine operating at a swift high-beat frequency of **28,800 vibrations per hour (8 beats per second)**. Highly celebrated by vintage purists for its micro-engineering excellence, this **25-jewel caliber** features **hacking seconds**, smooth manual-winding capability, and a rare **instantaneous day-date change mechanism** that snaps precisely at midnight.

Architectural ""6000"" Monocoque Case Geometry and Facets: The reference **5246-6000** is globally distinguished among serious collectors for its sharp, monocoque (one-piece) case architecture designed according to Taro Tanaka's foundational **""Grammar of Design""** principles. The solid stainless steel case features flat, razor-sharp facets and sweeping, broad-shouldered lugs finished with zero-distortion mirror polishing, allowing the watch to sit completely flat against the wrist.

Masterful Dual-Calendar Dial Harmony and Clinical Clarity: The dial of the **5246-6000** is a masterclass in clinical mid-century visual balance, showcasing a radiant canvas decorated with **hand-applied, multifaceted rectangular hour indices** and razor-sharp hands. Symmetrically framed at 3 o'clock, the dual-calendar window houses a **bilingual (English/Kanji) day disk** alongside a quick-set date wheel, proudly signed with the applied **""KS"" logo**, **""SPECIAL""** script, and official **""CHRONOMETER""** designation above 6 o'clock.

The Sovereign Gold KS Medallion or Engraved Back Heritage: The ultimate hallmark of this 1972 treasure sits proudly on the case back: the iconic **solid gold-embossed King Seiko medallion** (or deeply engraved Special Chronometer backplate). This emblem historically certified its elite factory-regulated chronometer accuracy and top-tier manufacturing status. Built to an uncompromising heirloom standard, the 5246-6000 Chronometer Special stands as an eternal, investment-grade cornerstone reference for collectors worldwide.

For more information, please look at the pictures.

Notes

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