Vintage 1971 JAPAN KING SEIKO CHRONOMETER SP WEEKDATER 5246-6010 25J Automatic.

Vintage 1971 JAPAN KING SEIKO CHRONOMETER SPECIAL WEEKDATER 5246-6010 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 : 190197.
• Dial number : JAPAN 5246-6010T.
• Glass : Acrylic.
• Case size : About 35.5mm.
• 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 Kanji.
  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 Peak of 1971 Daini Mechanical Luxury (1971): Manufactured in **1971**—a monumental year during Japan's peak post-war horological supremacy—the **King Seiko Chronometer Special Weekdater** represented Daini Seikosha's pinnacle achievement in automatic watchmaking. Sourced under reference **5246-6010**, this elite ""Special"" designated timepiece was factory-adjusted to strict internal chronometer specifications, serving as an exclusive status symbol for high-ranking executive professionals.

The Legendary High-Beat 28,800 VPH Caliber 5246 Heart: Powering this historic watch is the revered **25-jewel Caliber 5246A**, an in-house automatic movement operating at a high-beat frequency of **28,800 vibrations per hour (8 beats per second)**. Highly celebrated by vintage purists, this legendary 52-series movement featured instantaneous dual-calendar jumping at midnight, micro-regulator fine tuning, **hacking seconds**, and full hand-winding capability—a movement family so robust it later served as the architectural base for modern 4S automatic calibers.

Architectural ""6010"" Grammar of Design Case Geometry: The reference **5246-6010** is globally distinguished among collectors for its textbook execution of Taro Tanaka's **""Grammar of Design""** philosophy. The solid stainless steel case features sharp, angular facets and sweeping broad-shouldered lugs with mirror-polished Zaratsu finishing. Uniquely, the case incorporates a **front-loading (monocoque-style) construction** with an external fine-adjustment screw located between the lower lugs, allowing watchmakers to regulate timing without removing the movement.

Immaculate ""Chronometer Special"" Dial Harmony and Fine Typography: The dial of the **5246-6010** is a masterclass in clinical mid-century visual balance. Set against a radiant silver sunburst canvas, it features **hand-applied, multifaceted hour indices** with razor-sharp hands. The dial proudly displays **""CHRONOMETER OFFICIALLY CERTIFIED""** under the Seiko signature, with the applied **KS logo**, stylized **""Special"" cursive script**, **""HI-BEAT""** designation, and the Daini lightning bolt emblem balanced above 6 o'clock.

The Sovereign Daini Medallion and Legacy Heritage: The ultimate hallmark of this 1971 treasure sits on the case back: an iconic **gold-embossed King Seiko medallion** or deeply stamped Daini emblem, certifying its elite manufacturing status within Daini Seikosha. Standing as one of the finest automatic dress references ever produced by Seiko, the 5246-6010 Chronometer Special remains an indispensable, top-tier investment-grade cornerstone piece for serious vintage horology collectors worldwide.

For more information, please look at the pictures.

Notes

• Before buying.
  The vintage watches we sell are inspected and adjusted so they work fine. However, since it is an vintage watch, Please purchase on the assumption that it will be repaired.
  
  
• To prevent shipping accidents.
  Please monitor the tracking number until the item arrives and if it stagnates, please investigate at your country post office. Also, please confirm the item when you receive the item.
  
  
• About import taxes.
  Taxes such as import duties and VAT are not included in the item price or shipping charges, except for items shipped to the US. When you purchase, you will likely be required to pay these fees in your country.
  
  
• About Payment, Shipping, Return.
  Payment, Shipping, Return are in accordance with eBay's business policies.