Serviced Vintage 1971 JAPAN SEIKO LORD MATIC WEEKDATER 5606-7140 25J Automatic.

Serviced Vintage 1971 JAPAN SEIKO LORD MATIC WEEKDATER 5606-7140 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 : 131452.
• Dial number : JAPAN 5606-7330S.
• Glass : Crystal.
• Case size : About 36mm.
• 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.
• Overhaul service in May 2026.
  The movement has been cleaned and oiled, so it works fine.

Key Features

The Pinnacle of Executive Precision (1971): In **1971**, the **Seiko Lord Matic (LM)** stood as the definitive timepiece for the elite of Japan's rapidly modernizing professional class. The reference **5606-7140** was produced by the **Suwa Seikosha** factory during a landmark year when mechanical watchmaking reached its ergonomic and aesthetic peak. It arrived as a sophisticated instrument that offered a ""Grand Seiko-like"" presence, defining the optimistic, high-growth energy of the early 1970s through its sharp, clinical elegance.

The Upgraded 25-Jewel Caliber 5606 Heart: This watch is powered by the **25-jewel Caliber 5606**, a premium high-spec version of the movement operating at **21,600 vibrations per hour (vph)**. In **1971**, while standard LM models often utilized 23 jewels, the **25-jewel specification** was a mark of superior mechanical luxury, utilizing extra synthetic rubies to ensure an ultra-low friction environment for the calendar and gear trains. This caliber featured **hacking seconds**, manual winding, and a slim profile that allowed for an exceptionally sleek wrist presence.

Architectural ""7140"" Fluid Case Design: The reference **5606-7140** is celebrated for its masterful case geometry, which blends the sharp edges of the **""Grammar of Design""** with the flowing, integrated lines favored in the early 70s. The stainless steel case features multifaceted lugs and mirror-polished surfaces that create a brilliant play of light. In **1971**, this architectural approach ensured the watch maintained a ""sparkling"" and dignified executive silhouette while sitting flush and comfortably on the wrist.

Masterful ""Weekdater"" Dial Harmony: The dial of the **5606-7140** is a study in functional luxury, featuring a radiant sunburst silver finish and **hand-applied, multi-faceted baton indices**. The dual-calendar window at 3 o'clock houses a **bilingual (English/Kanji) day disk**, prioritizing professional clarity for the internationalizing Japanese workforce. The applied **""LM"" logo** and the Suwa lightning bolt symbol at 6 o'clock remain prestigious hallmarks of an era that valued uncompromising industrial pride.

A Landmark of Suwa's Slim Mechanical Legacy: Produced in **1971**, the 5606-7140 remains a highly coveted reference for collectors of the ""Mechanical Golden Age."" It represents the perfect intersection of **mechanical complexity and the minimalist modernist movement** of the early 1970s. It stands as a testament to an era when Suwa Seikosha perfected the **""high-utility professional automatic,""** creating a reliable and visually striking masterpiece that remains as accurate and stylish today as it was over half a century ago.

For more information, please look at the pictures.

Notes

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