Serviced Vintage 1972 JAPAN SEIKO LORD MATIC WEEKDATER 5606-7140 25J Automatic.

Serviced Vintage 1972 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 : 220484.
• Dial number : JAPAN 5606-7340T.
• Glass : Crystal.
• Case size : About 36.3mm.
• Lug width : 18mm.
• Band : Wrist size that can be worn is Up to about 190mm.

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 September 2026.
  The movement has been cleaned and oiled, so it works fine.

Key Features

The Sovereign Peak of 1972 Executive Luxury (1972): Manufactured in **1972**—a milestone historical year during Japan's peak post-war industrial confidence and golden era of mechanical horology—the **Seiko Lord Matic Weekdater** represented the definitive standard of mid-century corporate prestige. Born from the prestigious **Suwa Seikosha** factory under reference **5606-7140**, this flagship model sat directly below the King Seiko line, combining chronometer-adjacent mechanical refinement with bold, forward-looking Showa-era styling.

The High-Performance 25-Jewel Caliber 5606 Automatic Heart: Powering this historic timepiece is the revered **25-jewel Caliber 5606**, an in-house automatic engine operating at a smooth frequency of **21,600 vibrations per hour (vph)**. Celebrated by vintage purists for its ultra-slim profile and exceptional daily accuracy, this caliber deployed a lavish **25-jewel specification** to control gear-train friction. It incorporates modern executive conveniences including **hacking seconds**, quick-set dual calendar functionality, and manual-winding capability.

Architectural ""7140"" Angular Case Geometry and Facets: The reference **5606-7140** is globally distinguished among vintage collectors for its striking angular case architecture. The solid stainless steel case features sharp, multifaceted planes and broad-shouldered lugs finished with zero-distortion mirror polishing inspired by Taro Tanaka's **""Grammar of Design""** principles. This low center-of-gravity engineering allows the watch to sit completely flush against the wrist, sliding effortlessly under a tailored executive cuff.

Masterful ""Weekdater"" Dial Harmony and Bilingual Utility: The dial of the **5606-7140** is a study in 1970s visual elegance, showcasing a radiant canvas paired with **hand-applied, multifaceted hour indices** and razor-sharp hands that catch light with high contrast. Positioned neatly at 3 o'clock, the dual-calendar aperture houses a **bilingual (English/Kanji) day disk** alongside a quick-set date wheel, perfectly anchored by the applied metal **""LM"" emblem** above 6 o'clock.

An Investment-Grade Masterpiece of Suwa's Automatic Heritage: Manufactured in the milestone mechanical year of **1972**, the 5606-7140 25-jewel Lord Matic Weekdater remains a highly coveted, universally respected cornerstone reference for serious vintage Seiko collectors worldwide. It captures the exact historical moment where Suwa Seikosha perfected high-utility automatic daily instruments right before the global watch industry shifted toward quartz technology. Built to an uncompromising heirloom standard, it stands as an eternal testament to 1970s Japanese horological design.

For more information, please look at the pictures.

Notes

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