Serviced Vintage 1973 JAPAN SEIKO LORD MATIC WEEKDATER 5606-7231 25J Automatic.

Vintage 1973 JAPAN SEIKO LORD MATIC WEEKDATER 5606-7231 25Jewels Automatic.

Welcome to my auction!

Item description

Movement :

• Pet name : 56 LORD MATIC WEEKDATER .
• Caliber No. : 5606A.
• Movement : Automatic.
• Beat rate : 21600bph.
• Year of manufacture start : 1968's.
• Factory : Suwa.

Externals :

• Serial No. : 393773.
• Dial No. : JAPAN 5606-7550T.
• Glass : Crystal.
• Case size : About 36.2mm.
• Lug width : 19mm.
• Band : Wrist size that can be worn is Up to about 193mm.

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.
• Overhaul service in October 2026.
  The movement has been cleaned and oiled, so it works fine.

Key Features

• The Sovereign Benchmark of 1973 Executive Luxury (1973): Manufactured in 1973—a milestone historical year during Japan's golden era of high-utility mechanical horology—the Seiko Lord Matic Weekdater stood as Suwa Seikosha's preeminent accessible executive dress watch. Sourced under reference 5606-7231, this model occupied a crucial spot in the LM hierarchy, offering near-chronometer-grade automatic engineering wrapped in sharp, forward-looking 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 thin 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 "7231" Faceted Case Geometry and Contours: The reference 5606-7231 is globally distinguished among vintage purists for its distinct, sharp-faceted case architecture. Executed in solid stainless steel, the case features crisp angles, sweeping lug lines, and broad polished bevels inspired by Taro Tanaka's "Grammar of Design" principles, engineered to sit low and flush against the wrist.
• Masterful Dual-Calendar Dial Harmony and Bilingual Legibility: The dial of the 5606-7231 showcases exceptional early-1970s visual balance, displaying a radiant silver sunburst 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 1973, the 5606-7231 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 mechanical daily-wear elegance.

For more information, please look at the pictures.

Notes

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