Vintage 1973 JAPAN SEIKO LORD MATIC WEEKDATER 5606-7231 25Jewels Automatic.

Vintage 1973 JAPAN SEIKO LORD MATIC WEEKDATER 5606-7231 25Jewels Automatic.

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

Item description

Movement :

• Pet name : 56 LORD MATIC WEEKDATER .
• Caliber number : 5606A.
• Movement : Automatic.
• Beat rate : 21600bph.
• Year of manufacture start : 1968's.
• Factory : Suwa.

Externals :

• Serial number : 393773.
• Dial number : JAPAN 5606-7550T.
• Glass : Crystal.
• Case size : About 36.2mm.
• Lug width : 19mm.
• Band : Wrist size that can be worn is Up to about 193mm.

Condition :

• Used, it runs well.
• Quick set(Day/Date) : Okay.
  Set the day of the week can be in English or Japanese.
  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 1973 Executive Luxury (1973): Manufactured in **1973**—a milestone historical year during Japan's golden era of high-utility mechanical horology—the **Seiko Lord Matic Weekdater** stood as Suwa Seikosha's preeminent accessible executive dress watch. Sourced under reference **5606-7231**, this model occupied a crucial spot in the LM hierarchy, offering near-chronometer-grade automatic engineering wrapped in sharp, forward-looking Showa-era styling.

The Over-Engineered 25-Jewel Caliber 5606 Automatic Engine: Powering this historic timepiece is the elevated **25-jewel Caliber 5606**, an in-house automatic movement operating at a smooth frequency of **21,600 vibrations per hour (vph)**. Celebrated by collectors for its remarkably thin profile and long-term daily stability, this iteration deployed a lavish **25-jewel specification** to control gear-train friction. It features **hacking seconds**, quick-set dual calendar functionality, and smooth manual-winding capability.

Architectural ""7231"" Faceted Case Geometry and Contours: The reference **5606-7231** is globally distinguished among vintage purists for its distinct, sharp-faceted case architecture. Executed in solid stainless steel, the case features crisp angles, sweeping lug lines, and broad polished bevels inspired by Taro Tanaka's **""Grammar of Design""** principles, engineered to sit low and flush against the wrist.

Masterful Dual-Calendar Dial Harmony and Bilingual Legibility: The dial of the **5606-7231** showcases exceptional early-1970s visual balance, displaying a radiant silver sunburst canvas decorated with **hand-applied, multifaceted rectangular block indices** and razor-sharp hands. Symmetrically framed at 3 o'clock, the dual-calendar window houses a **bilingual (English/Kanji) day disk** alongside a quick-set date configuration, proudly bearing the applied **""LM"" emblem** above 6 o'clock.

An Investment-Grade Classic of Suwa's Automatic Legacy: Manufactured in the milestone mechanical year of **1973**, the 5606-7231 25-jewel Lord Matic Weekdater remains a highly sought-after, universally respected cornerstone reference for serious vintage Seiko collectors worldwide. It stands as an eternal testament to 1970s Japanese horological design, capturing the precise peak of mechanical daily-wear elegance.

For more information, please look at the pictures.

Notes

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