Vintage 1975 JAPAN SEIKO LORD MATIC WEEKDATER 5606-8051 23Jewels Automatic.

Vintage 1975 JAPAN SEIKO LORD MATIC WEEKDATER 5606-8051 23Jewels 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 : 5N6146.
• Dial number : JAPAN5606-8080T.
• Glass : Crystal.
• Case size : About 36.5mm.
• 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 Japanese.
  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 Luxury (1975): Manufactured in **1975**—a pivotal historical year during Japan's mature post-war economic boom and the twilight of the golden age of mechanical horology—the **Seiko Lord Matic Weekdater** stood as the quintessential executive dress watch. Born from the prestigious **Suwa Seikosha** factory under reference **5606-8051**, this mid-1970s flagship sat directly beneath the King Seiko lineup, offering near-chronometer-grade mechanical performance paired with refined Showa-era styling.

The Over-Engineered 23-Jewel Caliber 5606 Automatic Heart: Powering this historic instrument is the revered **23-jewel Caliber 5606A**, 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 movement deploys a lavish **23-jewel specification** to control gear-train friction. It features key executive conveniences including **hacking seconds**, quick-set dual calendar functionality, and smooth manual-winding capability.

Architectural ""8051"" Grammar of Design Case Geometry: The reference **5606-8051** is globally distinguished among vintage Seiko collectors for its sharp execution of Taro Tanaka's **""Grammar of Design""** principles. Executed in solid stainless steel, the case features razor-sharp angular facets, bold sweeping lugs, and zero-distortion mirror-polished Zaratsu planes. This low center-of-gravity engineering allows the mechanical instrument to sit completely flush against the wrist, sliding effortlessly under a tailored shirt cuff.

Masterful ""Weekdater"" Dial Harmony and Bilingual Utility: The dial of the **5606-8051** is a masterclass in mid-1970s visual balance, showcasing a radiant silver sunburst or richly colored canvas decorated with **hand-applied, multifaceted hour indices** and 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 wheel, offset by the applied polished **""LM"" emblem** above 6 o'clock.

An Investment-Grade Masterpiece of Suwa's Automatic Heritage: Manufactured in the milestone mechanical year of **1975**, the 5606-8051 23-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 1970s Japanese horological design.

For more information, please look at the pictures.

Notes

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