Vintage 1970 JAPAN KING SEIKO CHRONOMETER CALENDAR 4502-8010 25J Hand-winding.

Vintage 1970 JAPAN KING SEIKO SUPERIOR CHRONOMETER CALENDAR 4502-8010 25Jewels Hand-winding.

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

Item description

Movement :

• Pet name : 45 KING SEIKO CHRONOMETER CALENDAR .
• Caliber number : 4502A.
• Movement : Hand-winding.
• Beat rate : 36000bph.
• Year of manufacture start : 1969's.
• Factory : Kameido.

Externals :

• Serial number : 050921.
• Dial number : JAPAN 4502-8020T.
• Glass : Acrylic.
• Case size : About 37mm.
• 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.
• For practical, everyday use, it would be advisable to have the movement cleaned and oiled.

Key Features

The Sovereign Peak of 1970 Manual High-Beat Horology (1970): Manufactured in **1970**—at the absolute height of Daini Seikosha's internal accuracy competitions—the **King Seiko Superior Chronometer Calendar** reference **4502-8010** stands as one of the most mechanically elite hand-wound dress watches ever produced. Rated above standard internal chronometers, the ""Superior Chronometer"" designation represented Daini's uncompromising response to Swiss Observatory standards.

The Legendary 36,000 VPH Ultra-High Beat Caliber 4502 Engine: Powering this historic instrument is the celebrated **25-jewel Caliber 4502A**, an in-house manual-winding engine operating at a staggering ultra-high-beat frequency of **36,000 vibrations per hour (10 beats per second)**. Renowned among master watchmakers for its incredible regulation potential, this movement features **hacking seconds**, instantaneous date switching, and an ultra-precise balance assembly designed for extreme rate stability.

Architectural ""8010"" Pure Grammar of Design Case Geometry: Sourced in a solid stainless steel case, the reference **4502-8010** is globally recognized as a textbook execution of Taro Tanaka's **""Grammar of Design""** guidelines. The case features flat, razor-sharp Zaratsu-polished planes, bold angular lugs, and zero-distortion mirror surfaces designed to catch and reflect ambient light from every angle.

Clinical Calendar Dial Harmony and Elite ""Superior"" Branding: The dial of the **4502-8010** is a masterclass in clinical perfection, displaying a radiant silver sunburst canvas set with **hand-applied, multifaceted rectangular block indices** with fine black central inserts. Free from day-window clutter, the neatly framed date aperture at 3 o'clock is balanced by the applied **""KS"" logo**, **""HI-BEAT""** text, and the prestigious **""SUPERIOR CHRONOMETER""** script above 6 o'clock.

The Sovereign Solid Gold KS Chronometer Case Back Medallion: The ultimate hallmark of this 1970 horological masterpiece rests on the case back: the iconic **solid gold-embossed King Seiko Chronometer medallion** set flush into the case center. Certifying its elite factory-regulated rating and historical standing within Daini Seikosha's legacy, the 4502-8010 Superior Chronometer remains an essential, holy-grail investment-grade reference for collectors worldwide.

For more information, please look at the pictures.

Notes

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