Vintage 1971 JAPAN KING SEIKO WEEKDATER 5626-7110 25Jewels Automatic.

Vintage 1971 JAPAN KING SEIKO WEEKDATER 5626-7110 25Jewels Automatic.

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

Item description

Movement :

• Pet name : 56 KING SEIKO WEEKDATER .
• Caliber number : 5626A,B.
• Movement : Automatic.
• Beat rate : 28800bph.
• Year of manufacture start : 1968's.
• Factory : Suwa.

Externals :

• Serial number : 162564.
• Dial number : JAPAN 5626-7110T.
• Glass : Crystal.
• Case size : About 36.5mm.
• 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 Zenith of 1971 Executive Dress Architecture (1971): Manufactured in **1971**—during the prime mechanical operational era of Suwa Seikosha—the **King Weekdater** reference **5626-7110** represented the ultimate expression of executive dual-calendar timepieces. Designed to deliver high-beat accuracy alongside complete daily calendar functionality, this reference stood as one of the definitive mid-1970s choices for high-ranking corporate professionals.

The High-Beat 25-Jewel Caliber 5626 Automatic Engine: Powering this historic instrument is the elevated **25-jewel Caliber 5626A**, an in-house automatic movement operating at a swift high-beat frequency of **28,800 vibrations per hour (8 beats per second)**. Outfitted with a **25-jewel count** for optimal gear-train friction reduction, this engine features **hacking seconds**, manual-winding capability, and a dual-calendar quick-set mechanism driving both time and calendar functions with extreme precision.

Architectural ""7110"" Case and Pure Grammar of Design Lines: Sourced in a solid stainless steel case, the reference **5626-7110** displays textbook adherence to Taro Tanaka's **""Grammar of Design""** guidelines. Featuring broad, sweeping angular lugs, flat Zaratsu-polished planes, and zero-distortion mirror surfaces, the case geometry reflects light with razor-sharp brilliance while maintaining a low-profile, commanding presence on the wrist.

Masterful Dual-Calendar Dial Harmony and Clinical Clarity: The dial of the **5626-7110** showcases mid-1970s executive refinement, displaying a radiant silver sunburst canvas decorated with **hand-applied, multifaceted rectangular block indices** with black central inserts. Positioned neatly at 3 o'clock, the dual-calendar aperture houses a **bilingual (English/Kanji) day disk** alongside a quick-set date wheel, perfectly balanced by the applied metal **""KS"" emblem** and **""HI-BEAT""** typography above 6 o'clock.

The Sovereign Solid Gold KS Shield Case Back Medallion: The ultimate hallmark of origin rests on the case back: the iconic **solid gold-embossed King ""KS"" shield medallion** set flush into the center. Certifying its elite factory-regulated chronometric standards and historical standing within Suwa Seikosha's legacy, the 1971 5626-7110 King Weekdater remains an indispensable, investment-grade cornerstone reference for serious vintage watch collectors worldwide.

For more information, please look at the pictures.

Notes

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