Vintage 1975 JAPAN SEIKO LORD MATIC WEEKDATER 5606-8120 25Jewels Automatic.

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

Item description

It's a SEIKO Automatic Watch, LORD MATIC WEEKDATER 5606-8120 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 : 571979.
  • Dial number : JAPAN 5606-8160T.
  • Glass : Crystal.
  • Case size : About 36.1mm.
  • Lug width : 18mm.
  • Band : Wrist size that can be worn is Up to about 192mm.
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 Era of Mid-70s Expressive Luxury (1975): In **1975**, the **Seiko Lord Matic (LM)** embraced a vibrant evolution, serving as the premier lifestyle choice for the bold, style-conscious Japanese professional. The reference **5606-8120** was produced by the **Suwa Seikosha** factory during a transitional era when mechanical watchmaking integrated avant-garde fashion to stand alongside the emerging quartz technology. It offered a sophisticated blend of reliable engineering and rich, textured aesthetics that perfectly captured the expressive, confident energy of the mid-1970s.
  • The Premium 25-Jewel Caliber 5606 Heart: This watch is powered by the **25-jewel Caliber 5606**, a high-spec luxury version of the movement operating at **21,600 vibrations per hour (vph)**. In **1975**, while the base Lord Matic models utilized 23 jewels, the **25-jewel specification** was a distinct hallmark of mechanical status, utilizing extra synthetic rubies to ensure an ultra-low friction environment for the gear and calendar trains. This caliber featured **hacking seconds**, manual winding, and a slim profile that allowed for an exceptionally sleek wrist presence.
  • Architectural ""8120"" Glamorous Case Geometry: The reference **5606-8120** is celebrated for its substantial case construction, featuring polished hooded lugs and a seamless integrated silhouette that paired beautifully with the **faceted crystals (cut glass)** highly favored in the mid-70s. In **1975**, this design departed from traditional 1960s minimalism to create a multi-dimensional, light-catching presence on the wrist, ensuring the watch maintained a highly distinctive and dignified executive profile.
  • Masterful ""Weekdater"" Dial Sensation: The dial of the **5606-8120** is a study in 1970s artistic clarity, frequently showcasing a deep, radiant **gradient finish** paired with **hand-applied, chunky faceted indices** that create incredible visual depth under the cut glass. The dual-calendar window at 3 o'clock houses a **bilingual (English/Kanji) day disk**, prioritizing everyday utility. The applied **""LM"" logo** and the Suwa lightning bolt symbol at 6 o'clock remain prestigious hallmarks of an era that valued bold industrial pride.
  • A Landmark of Suwa's Decorative Mechanical Legacy: Produced in **1975**, the 5606-8120 remains a highly coveted ""cult classic"" reference for collectors of the ""Mechanical Golden Age."" It represents the perfect intersection of **advanced mechanical complexity and the vibrant architectural design trends** of the turn of the decade. It stands as a testament to an era when Suwa Seikosha perfected the **""high-utility expressive dress watch,""** creating a reliable and visually captivating masterpiece that remains as stylish and accurate today as it was half a century ago.
    • For more information, please look at the pictures.
    Notes
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