Vintage 1971 JAPAN 45 KING SEIKO CALENDAR 4502-7001 25Jewels Hand-winding.

Vintage 1971 JAPAN 45 KING SEIKO CALENDAR 4502-7001 25Jewels Hand-winding.

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

Item description

Movement :

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

Externals :

• Serial number : 191901.
• Dial number : JAPAN 4502-7000T AD.
• Glass : Acrylic.
• Case size : About 36mm.
• 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 Icon of 1970 High-Beat Supremacy (1970): In **1970**—a monumental year highlighted by the Osaka EXPO '70 and Japan's peak industrial confidence—the **45 King (45KS)** represented the absolute pinnacle of manual-wind horology. Born from the legendary **Daini Seikosha (Kameido)** factory under reference **4502-7001**, this historic masterpiece was engineered explicitly to challenge the elite Swiss watchmaking houses. Positioned to deliver world-shaking mechanical precision, it served as an uncompromising status symbol for Japan's visionary leaders and top-tier executive class.

The Legendary 25-Jewel Caliber 4502 Ultra-High-Beat Heart: This watch is powered by the magnificent **25-jewel Caliber 4502**, a high-grade manual-wind engine operating at a blistering frequency of **36,000 vibrations per hour (10 beats per second)**. Sharing its elite architecture with the world-renowned Grand 45-series and the historical observatory chronometers that conquered international Swiss trials, this over-engineered movement deployed **25 jewels** to tame the immense kinetic friction of high-frequency operation, integrating a **seconds-hacking mechanism** and an instantaneous date-change system.

The Ultimate Geometric Execution of the ""Grammar of Design"": The reference **4502-7001** is globally celebrated among vintage purists as a textbook monument of Taro Tanaka's revolutionary **""Grammar of Design""** philosophy. The solid stainless steel case features **incredibly sharp, wide, and angular multi-faceted lugs** finished with zero-distortion mirror polishing and precise contrasting brushed textures. This low center-of-gravity, muscular structure was drawn explicitly to master the interplay of light and shadow, defining the aesthetic soul of luxury Japanese watchmaking.

Clinical Calendar Dial Legibility and Balanced Harmony: By utilizing a date-only layout instead of a dual-calendar disk, the dial achieves a magnificent level of **refined visual balance and clean symmetry**. The radiant silver sunburst canvas features **hand-applied, multifaceted chunky block indices** paired with razor-sharp Dauphine hands, ensuring split-second professional legibility. The face is beautifully completed by a neatly framed date window at 3 o'clock, the proud applied **""KS"" shield emblem**, and the bold typography proclaiming its **""HI-BEAT 36000""** velocity at 6 o'clock.

The Sovereign Glory of the Gold KS Medallion: Manufactured in the milestone mechanical year of **1970**, the 4502-7001 remains one of the most highly coveted, universally respected ""holy grails"" for serious vintage enthusiasts worldwide. The ultimate hallmark of its premium internal pedigree sits embedded on the screw-down case back: a **solid gold, crisply embossed ""KS"" Medallion** designed to officially guarantee its high-luxury manufacturing credentials. It stands as a profound testament to an era when Kameido perfected the high-frequency instrument to an eternal, heirloom standard.

For more information, please look at the pictures.

Notes

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