Vintage 1974 JAPAN SEIKO LORD MATIC WEEKDATER 5606-8031 25Jewels Automatic.

Vintage 1974 JAPAN SEIKO LORD MATIC WEEKDATER 5606-8031 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 : 4D4264.
• Dial number : JAPAN5606-8060T.
• Glass : Crystal.
• Case size : About 37mm.
• Lug width : 18mm.
• Band : Wrist size that can be worn is Up to about 180mm.

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 Sovereign Peak of Mid-70s Executive Utility (1974): Manufactured in **1974**—a milestone historical year during the height of Japan's mechanical refining era—the **Seiko Lord Matic Weekdater** stood as Suwa Seikosha's preeminent accessible executive timepiece. Sourced under reference **5606-8031**, this model occupied a crucial position in the Lord Matic lineup, combining elevated movement finishing with classic, forward-looking 1970s 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 ultra-slim architectural 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 ""8031"" Faceted Case Geometry and Contours: The reference **5606-8031** is globally distinguished among vintage purists for its classic, broad-shouldered case architecture. Executed in solid stainless steel, the case features sharp geometric angles, sweeping lug shoulders, and broad zero-distortion mirror-polished bevels inspired by Taro Tanaka's **""Grammar of Design""** principles, engineered to sit flat and flush against the wrist.

Masterful Dual-Calendar Dial Harmony and Bilingual Utility: The dial of the **5606-8031** showcases exceptional mid-1970s visual balance, displaying a radiant silver or textured 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 **1974**, the 5606-8031 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 high-utility automatic daily instruments.

For more information, please look at the pictures.

Notes

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