Vintage 1973 JAPAN GRAND SEIKO WEEKDATER 5646-7011 25Jewels Automatic.

Vintage 1973 JAPAN GRAND SEIKO WEEKDATER 5646-7011 25Jewels Automatic.

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

Item description

Movement :

• Pet name : 56 GRAND SEIKO WEEKDATER .
• Caliber number : 5646A.
• Movement : Automatic.
• Beat rate : 28800bph.
• Year of manufacture start : 1970's.
• Factory : Suwa.

Externals :

• Serial number : 3N0730.
• Dial number : JAPAN 5646-7010T.
• Glass : Crystal.
• Case size : About 36.8mm.
• 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 Peak of 1973 Grand Seiko Prestige (1973): Manufactured in **1973**—a historic year when Japanese mechanical mastery stood at its absolute pinnacle of precision and executive luxury—the **Grand Seiko Weekdater (56GS)** represented the apex of elite dress watchmaking. Born from the **Suwa Seikosha** factory under reference **5646-7011**, this premium automatic timepiece was built to the uncompromising ""Grand Seiko Standard."" It served as a proud status symbol for Japan's high-society leaders during the heights of the Showa economic miracle.

The Elite 25-Jewel Caliber 5646 High-Beat Heart: This masterpiece is powered by the magnificent **25-jewel Caliber 5646**, an in-house automatic engine operating at a swift high-beat frequency of **28,800 vibrations per hour (8 beats per second)**. Highly celebrated by vintage purists for its remarkably slim architecture and exceptional daily stability, this movement represents the technical zenith of the 56-series automatic lineage. Utilizing a premium **25-jewel specification**, it features executive functions like **hacking seconds** and manual-winding capability.

Architectural ""7011"" Grammar of Design Case Mastery: The reference **5646-7011** is globally sought after for its flawless implementation of Seiko's foundational **""Grammar of Design""** philosophy. The solid stainless steel case features incredibly sharp, muscular facets and robust, beautifully tapered lugs finished with zero-distortion mirror polishing. This low center-of-gravity design allows the watch to sit entirely flush against the skin, sliding effortlessly under a tailored executive shirt cuff.

Immaculate Weekdater Dial Harmony and Bilingual Utility: The dial of the 5646-7011 is a masterclass in clinical luxury, showcasing a radiant silver sunburst canvas decorated with **hand-applied, multifaceted elongated indices** and razor-sharp GS-specific hands. Symmetrically balanced at 3 o'clock, the dual-calendar window houses a **bilingual (English/Kanji) day disk**, prioritizing instant split-second corporate legibility for the globalizing business elite.

The Iconic Gold GS Medallion of Mechanical Excellence: The ultimate hallmark of this vintage treasure sits proudly on the screw-down case back: a **pristine, gold-embossed Grand Seiko medallion**. This legendary crest historically certified its elite water-resistant status and supreme, factory-regulated timing accuracy. Built to an uncompromising heirloom standard that easily transcends passing fashion trends, this 1973 timepiece stands as an eternal testament to the golden age of Japanese mechanical design.

For more information, please look at the pictures.

Notes

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