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 : 557146.
• Dial number : JAPAN5606-8080T.
• Glass : Crystal.
• Case size : About 37mm.
• 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 Benchmark of Mid-70s Executive Utility (1975): Manufactured in **1975**—a milestone transitional year during the twilight of Seiko's classic mechanical golden age—the **Seiko Lord Matic Weekdater** reference **5606-8051** represented Suwa Seikosha's benchmark accessible executive timepiece. Designed for discerning corporate professionals, this late-series Lord Matic model offered proven automatic engineering paired with sharp, forward-looking mid-1970s Showa-era styling.

The Proven 23-Jewel Caliber 5606 Automatic Engine: Powering this historic timepiece is the renowned **23-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 thin profile and long-term daily stability, this movement features essential executive conveniences including **hacking seconds**, quick-set dual calendar functionality, and smooth manual-winding capability.

Architectural ""8051"" Sharp-Faceted Case Geometry: Sourced in a solid stainless steel case, the reference **5606-8051** is globally recognized among vintage purists for its angular, sharp-faceted case architecture. Featuring sweeping lug shoulders and broad zero-distortion mirror-polished bevels inspired by Taro Tanaka's **""Grammar of Design""** guidelines, the low-profile case sits remarkably flat and flush against the wrist.

Masterful Dual-Calendar Dial Harmony and Visual Balance: The dial of the **5606-8051** showcases exceptional mid-1970s visual restraint, displaying a radiant silver or textured canvas set with **hand-applied, multifaceted rectangular block indices** and sharp hands. Symmetrically framed at 3 o'clock, the dual-calendar window houses a **bilingual (English/Kanji) day disk** alongside a quick-set date wheel, proudly bearing the applied **""LM"" emblem** above 6 o'clock.

An Investment-Grade Classic of Suwa's Automatic Heritage: Produced near the final phase of the iconic 56LM production run in **1975**, the 5606-8051 23-jewel Lord Matic Weekdater remains a highly sought-after, universally respected cornerstone reference for serious vintage Seiko collectors. It stands as an eternal testament to mid-1970s Japanese horological craftsmanship, capturing the precise peak of high-utility automatic daily instruments.

For more information, please look at the pictures.

Notes

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