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 : 091619.
• 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 Daini Precision Mastery (1970): Manufactured in **1970**—a milestone historical year defined by the Osaka Expo '70 and Japan's peak post-war industrial supremacy—the **King Superior Chronometer (45KS)** represented Daini Seikosha's ultimate achievement in manual-wind chronometry. Sourced under reference **4502-8010**, this ultra-rare ""Superior Chronometer"" variant was factory-adjusted to internal precision standards that rivaled and surpassed official Swiss COSC regulations, serving as an elite status symbol for high-society executives.

The Legendary 36,000 VPH High-Beat Caliber 4502 Heart: This masterpiece is powered by the iconic **25-jewel Caliber 4502A**, an in-house manual-wind movement operating at a blistering frequency of **36,000 vibrations per hour (10 beats per second)**. Globally celebrated by purists as one of the finest hand-wound engines ever constructed, this **25-jewel specification** utilized elite micro-engineering to control gear friction, delivering extraordinary daily chronometric stability, **hacking seconds**, and an instant-change calendar mechanism.

Architectural ""8010"" Cushion-Style Case Geometry: The reference **4502-8010** is globally distinguished among serious collectors for its distinctive, bold cushion-style case architecture. Departing from traditional sharp angular lugs, the solid stainless steel case features sweeping, broad-shouldered contours with mirror-polished bevels engineered according to Taro Tanaka's **""Grammar of Design""** guidelines. This low center-of-gravity design allows the mechanical instrument to sit completely flush against the wrist, sliding weightlessly under a tailored cuff.

Immaculate ""Superior Chronometer"" Dial Harmony: The dial of the **4502-8010** is a masterclass in clinical mid-century luxury, showcasing a radiant silver sunburst canvas proudly bearing the rare **""SUPERIOR CHRONOMETER""** official designation. It features **hand-applied, multifaceted rectangular block indices** with elegant black insert details and razor-sharp hands that catch light with high contrast. Symmetrically framed at 3 o'clock, the quick-set date window provides crisp date tracking, completed by the applied **KS logo** and Daini lightning bolt emblem above 6 o'clock.

The Sovereign Gold KS Medallion of Kameido's Heritage: The ultimate hallmark of this 1970 treasure sits proudly on the case back: a **pristine, solid gold-embossed King (KS) medallion**. This iconic emblem historically certified its elite manufacturing status and supreme, factory-regulated chronometer timing accuracy. Built to an uncompromising heirloom standard, the 4502-8010 Superior Chronometer stands as an eternal, investment-grade cornerstone reference for vintage collectors worldwide.

For more information, please look at the pictures.

Notes

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