Vintage 1973 JAPAN SEIKO LORD MATIC WEEKDATER 5606-7230 25Jewels Automatic.

Vintage 1973 JAPAN SEIKO LORD MATIC WEEKDATER 5606-7230 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 : 362156.
• Dial number : JAPAN 5606-7550T.
• Glass : Crystal.
• Case size : About 36.5mm.
• Lug width : 19mm.
• Band : Wrist size that can be worn is Up to about 194mm.

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 Benchmark of 1973 Executive Luxury (1973): Manufactured in **1973**—a pivotal historic year during Japan's peak post-war industrial era and the golden age of mechanical horology—the **Seiko Lord Matic Weekdater** stood as the definitive benchmark of accessible executive prestige. Born from the prestigious **Suwa Seikosha** factory under reference **5606-7230**, this flagship timepiece sat directly below the King Seiko series, delivering near-chronometer-grade mechanical performance wrapped in striking, forward-looking 1970s 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 remarkably thin profile and long-term daily stability, this caliber deployed a lavish **25-jewel specification** to control gear-train friction. It features modern executive conveniences including **hacking seconds**, quick-set dual calendar functionality, and smooth manual-winding capability.

Architectural ""7230"" Cushion Case Geometry and Contours: The reference **5606-7230** is globally distinguished among vintage collectors for its distinct, broad-shouldered cushion case architecture. The solid stainless steel case features sweeping, organic contours and robust integrated lug shoulders finished with zero-distortion mirror polishing inspired by Taro Tanaka's **""Grammar of Design""** principles. This low center-of-gravity engineering allows the mechanical instrument to sit completely flush against the wrist, sliding weightlessly under a tailored shirt cuff.

Masterful ""Weekdater"" Dial Harmony and Bilingual Utility: The dial of the **5606-7230** is a study in 1970s visual balance, showcasing a radiant canvas decorated with **hand-applied, multifaceted rectangular block indices** and razor-sharp hands that catch light with high contrast. Symmetrically framed at 3 o'clock, the dual-calendar window houses a **bilingual (English/Kanji) day disk** alongside a quick-set date configuration, prioritizing instant split-second legibility for the modern workforce.

An Investment-Grade Masterpiece of Suwa's Automatic Heritage: Manufactured in the milestone mechanical year of **1973**, the 5606-7230 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 industry shifted toward digital quartz technology. Built to an uncompromising heirloom standard, it stands as an eternal testament to mid-1970s Japanese horological design.

For more information, please look at the pictures.

Notes

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