Vintage 1972 JAPAN KING SEIKO CHRONOMETER WEEKDATER 5626-7040 25J Automatic.

Vintage 1972 JAPAN KING SEIKO CHRONOMETER WEEKDATER 5626-7040 25Jewels Automatic.

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

Item description

Movement :

• Pet name : 56 KING SEIKO CHRONOMETER WEEKDATER .
• Caliber number : 5626A,B.
• Movement : Automatic.
• Beat rate : 28800bph.
• Year of manufacture start : 1969's.
• Factory : Suwa.

Externals :

• Serial number : 230769.
• Dial number : JAPAN 5626-7040T.
• Glass : Crystal.
• 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 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 Benchmark of 1972 Suwa Chronometry (1972): Manufactured in **1972**—a landmark year during Suwa Seikosha's golden era of mechanical chronometer production—the **King Seiko Chronometer Weekdater (56KS)** represented the pinnacle of high-precision executive timepieces. Sourced under reference **5626-7040**, this officially certified chronometer was engineered to match strict internal performance standards while showcasing classic 1970s Showa-era luxury.

The Legendary High-Beat 25-Jewel Caliber 5626 Heart: Powering this historic instrument is the high-grade **25-jewel Caliber 5626A**, an in-house automatic engine operating at a swift high-beat frequency of **28,800 vibrations per hour (8 beats per second)**. Regulated at the factory to chronometer-grade tolerances, this **25-jewel movement** features **hacking seconds**, smooth manual-winding capability, and a dual-calendar quick-set mechanism.

Architectural ""7040"" Monocoque Case and Grammar of Design Geometry: The reference **5626-7040** is globally distinguished among vintage purists for its sharp, front-loading **monocoque (one-piece) stainless steel case architecture**. Built strictly in accordance with Taro Tanaka's **""Grammar of Design""** philosophy, the case features razor-sharp Zaratsu-polished facets, bold sweeping lugs, and a low center of gravity that sits completely flush against the wrist.

Masterful Dual-Calendar Dial Harmony and Clinical Clarity: The dial of the **5626-7040** showcases clinical mid-century visual balance, displaying a radiant silver sunburst canvas decorated with **hand-applied, multifaceted rectangular block indices** with black inserts. Symmetrically framed at 3 o'clock, the dual-calendar aperture houses a **bilingual (English/Kanji) day disk** alongside the date wheel, proudly signed with the applied **""KS"" logo**, **""HI-BEAT""** text, and official **""CHRONOMETER""** designation above 6 o'clock.

The Sovereign Solid Gold KS Chronometer Back Medallion: The ultimate seal of prestige rests on the case back: the iconic **solid gold-embossed King Seiko Chronometer medallion** set flush into the backplate. Certifying its elite accuracy standard and historical status within Suwa Seikosha's legacy, the 5626-7040 King Seiko Chronometer stands as an essential, investment-grade cornerstone reference for collectors worldwide.

For more information, please look at the pictures.

Notes

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