Serviced Vintage 1971 JAPAN KING SEIKO CHRONOMETER SP 5245-6010 25J Automatic.

Serviced Vintage 1971 JAPAN KING SEIKO CHRONOMETER SPECIAL 5245-6010 25Jewels Automatic.

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

Item description

Movement :

• Pet name : 52 KING SEIKO CHRONOMETER SPECIAL (CALENDAR) .
• Caliber number : 5245A.
• Movement : Automatic.
• Beat rate : 28800bph.
• Year of manufacture start : 1971's.
• Factory : Kameido.

Externals :

• Serial number : 150120.
• Dial number : JAPAN 5245-6010T.
• Glass : Crystal.
• Case size : About 34.7mm.
• Lug width : 18mm.
• Band : New Leather Strap of SEIKO original.

Condition :

• Used, it runs well.
• Quick set(Day/Date) : Okay.
  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.
• Overhaul service in September 2026.
  The movement has been cleaned and oiled, so it works fine.
• There is some peeling visible near the 6 o'clock position on the dial.

Key Features

The Apex of 1971 Daini Chronometric Perfection (1971): Manufactured in **1971**—a historic milestone year during Japan's peak post-war industrial supremacy—the **King Seiko Chronometer Special** reference **5245-6010** represented Daini Seikosha's absolute pinnacle of mechanical horology. Engineered in Kameido as an elite challenger to Grand Seiko, this ""Special"" variant carried official chronometer certification, embodying the supreme technical pride and precision standards of late-Showa watchmaking.

The Legendary High-Beat 25-Jewel Caliber 5245 Automatic Engine: Powering this historic timepiece is the revered **25-jewel Caliber 5245A**, an in-house automatic movement 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 sophistication, this caliber features **hacking seconds**, hand-winding capability, and a rare **instantaneous date change mechanism** that snaps precisely at midnight.

Architectural ""6010"" Grammar of Design Case Geometry: The reference **5245-6010** is globally distinguished among collectors for its textbook execution of Taro Tanaka's **""Grammar of Design""** principles. Executed in solid stainless steel, the case features razor-sharp, multifaceted angular lugs and mirror-polished Zaratsu planes engineered to reflect light without distortion, allowing the low-profile instrument to sit completely flush against the wrist.

Masterful Dial Harmony and Official Chronometer Branding: The dial of the **5245-6010** is a study in clinical mid-century visual balance. It showcases a radiant silver sunburst canvas decorated with **hand-applied, multifaceted hour indices** and sharp dauphine hands. The dial is proudly signed with **""OFFICIALLY CERTIFIED""**, the applied **""KS"" logo**, **""Special""** script, **""HI-BEAT""** designation, and the iconic Daini lightning bolt emblem above 6 o'clock.

An Investment-Grade Masterpiece of Kameido's Heritage: Manufactured during the milestone mechanical year of **1971**, the 5245-6010 King Seiko Special Chronometer remains one of the most historically significant, highly sought-after Daini references worldwide. Capturing the precise moment where Kameido perfected high-beat chronometric utility right before the industry shifted into quartz technology, it stands as an eternal, investment-grade cornerstone of Japanese horology.

For more information, please look at the pictures.

Notes

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