Vintage 1972 JAPAN SEIKO LORD MATIC WEEKDATER 5606-7240 25Jewels Automatic.

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

Item description

It's a SEIKO Automatic Watch, LORD MATIC WEEKDATER 5606-7240 25Jewels .
It's in good used condition.
It's difficult to find this valuable watch in such a good condition. Highly recommended for SEIKO collectors!
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 : 266918.
  • Dial number : JAPAN 5606-7570S.
  • Glass : Crystal.
  • Case size : About 37.1mm.
  • Lug width : 18mm.
  • 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 Spirit of 1972 Modernist Corporate Culture (1972): In **1972**, during a historic year marked by the Winter Olympics in Sapporo and Japan's peak post-war industrial confidence, the **Seiko Lord Matic (LM)** served as the premier timekeeping statement for the modernizing executive class. The reference **5606-7240** was engineered by the **Suwa Seikosha** factory during an era of tremendous lifestyle exploration. Designed as a high-spec luxury instrument, it provided the ambitious Showa-era business leader a perfect alternative to traditional circular watches, capturing the bold design language of the early 1970s.
  • The Premium Upgraded 25-Jewel Caliber 5606 Heart: This watch is powered by the rare, high-grade **25-jewel Caliber 5606**, an ultra-slim automatic movement operating at **21,600 vibrations per hour (vph)**. While standard mainstream Lord Matic models utilized a 23-jewel layout, this elite **25-jewel specification** was reserved for premium factory runs, deploying extra synthetic rubies to minimize gear-train friction and ensure extreme long-term daily stability. It features executive features like **hacking seconds**, manual-winding capability, and an integrated day-date quick-set.
  • Architectural ""7240"" Fluid Tonneau-Cushion Geometry: The reference **5606-7240** is highly celebrated among vintage purists for its distinctively stylish, retro-futuristic **tonneau-cushion case geometry**. Departing from conventional circular designs, the stainless steel case showcases sweeping contoured facets, wide integrated lugs, and beautiful mirror-polished edges that perfectly adapt Taro Tanaka's **""Grammar of Design""** guidelines into a softer, aerodynamic profile. This low center-of-gravity architecture minimized wrist fatigue while sliding effortlessly under a tailored suit cuff.
  • Masterful ""Weekdater"" Dial Sensation and Harmony: The dial of the **5606-7240** is a masterclass in early-1970s industrial aesthetics, frequently showcasing radiant sunburst transitions or dynamic colored canvases paired with **hand-applied, multifaceted block indices**. The dual-calendar window at 3 o'clock houses a **bilingual (English/Kanji) day disk**, prioritizing instant everyday legibility for the globalizing Japanese workforce. The applied, interlocking **""LM"" emblem** and the Suwa lightning bolt insignia at 6 o'clock remain proud hallmarks of pure manufacturing pride.
  • A Sovereign Masterpiece of Suwa's Golden Age: Produced in the milestone year of **1972**, the 5606-7240 25-jewel variant remains a highly coveted, investment-grade reference for serious collectors who value the **""Mechanical Golden Age.""** It represents the perfect historical intersection where rugged daily durability met early-1970s geometric experimentation and elite, high-jewel micro-engineering. It stands as a profound testament to an era when Suwa Seikosha built mechanical dress watches to such an uncompromising industrial standard that their timeless style effortlessly transcends passing trends.
    • For more information, please look at the pictures.
    Notes
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