Serviced Vintage 1970 JAPAN SEIKO LORD MATIC WEEKDATER 5606-7140 23Jewels Automatic.

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

Item description

It's a SEIKO Automatic Watch, LORD MATIC WEEKDATER 5606-7140 23Jewels .
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 : 095115.
  • Dial number : JAPAN 5606-7320T.
  • Glass : Crystal.
  • Case size : About 36.1mm.
  • Lug width : 18mm.
  • Band : Wrist size that can be worn is Up to about 198mm.
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.
  • Overhaul service in June 2026.
    The movement has been cleaned and oiled, so it works fine.
Key Features
  • The Spirit of 1970 Technological Optimism (1970): In **1970**, a landmark year defined by the Osaka EXPO '70 and Japan's roaring post-war economic miracle, the **Seiko Lord Matic (LM)** stood as the definitive lifestyle icon for the rising executive class. The reference **5606-7140** was engineered by the **Suwa Seikosha** factory to offer ambitious professionals an uncompromising alternative to heavy, bulky automatics. It perfectly encapsulated the disciplined aesthetic pride, structural confidence, and forward-thinking design energy that characterized the absolute height of the Showa boom.
  • The Time-Tested 23-Jewel Caliber 5606 Heart: This watch is powered by the famous **23-jewel Caliber 5606**, an ultra-slim high-grade automatic movement operating at **21,600 vibrations per hour (vph)**. Highly regarded for its advanced low-profile architecture, this 56-series engine allowed Seiko to achieve sleeker dress silhouettes without sacrificing mechanical stability. It integrates premium corporate features including a **seconds-hacking mechanism** for precise time-setting, manual-winding capability, and a robust dual-calendar display.
  • Architectural ""7140"" Fluid Tonneau-Cushion Case: The reference **5606-7140** is celebrated among vintage purists for its distinctively stylish **tonneau-cushion case geometry**. Departing from traditional circular shapes, the stainless steel case features wide, fluidly integrated lugs and beautifully contoured, sweeping facets that perfectly implement Taro Tanaka's **""Grammar of Design""** principles. This low center-of-gravity architecture minimized wrist fatigue while creating a bold, distinctly retro-modern presence that slid effortlessly under a tailored suit cuff.
  • Masterful ""Weekdater"" Dial Legibility and Purity: The dial of the **5606-7140** is a study in clinical mid-century luxury, showcasing a radiant silver sunburst canvas decorated with **hand-applied, multifaceted block indices** with dark contrast inserts. The dual-calendar window at 3 o'clock houses a **bilingual (English/Kanji) day disk**, prioritizing split-second legibility for a globalizing Japanese workforce. The perfectly symmetrical applied **""LM"" interlocking emblem** and the Suwa lightning bolt insignia at 6 o'clock remain proud badges of pure industrial craftsmanship.
  • A Cornerstone of Suwa's Everyday Executive Legacy: Produced in the milestone year of **1970**, the 5606-7140 remains a highly coveted, investment-grade reference for collectors who value the **""Mechanical Golden Age.""** It represents the perfect historical intersection where rugged daily durability met early-1970s geometric minimalism and elite micro-engineering. It stands as a profound testament to an era when Suwa Seikosha built mechanical dress watches to an indestructible, uncompromised industrial standard that effortlessly transcends passing horological trends.
    • For more information, please look at the pictures.
    Notes
    • Before buying.
      The vintage watches we sell are inspected and adjusted so they work fine. However, since it is an vintage watch, Please purchase on the assumption that it will be repaired.

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