Vintage 1975 JAPAN SEIKO LORD MATIC WEEKDATER 5606-8090 23Jewels Automatic.

Vintage 1975 JAPAN SEIKO LORD MATIC WEEKDATER 5606-8090 23Jewels Automatic.

Welcome to my auction!
I am Japanese who live in Tokyo.

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. : 5N3264.
• Dial No. JAPAN 5606-8130T.
• Glass : Crystal.
• Case size : About 36.7mm.
• Lug width : 19mm.
• Band : New Leather Strap of SEIKO original.

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 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 mechanical era—the Seiko Lord Matic Weekdater reference 5606-8090 stood as the quintessential executive dress watch. Born from the prestigious Suwa Seikosha factory, 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 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 movement deploys a 23-jewel specification to control gear-train friction, featuring key executive conveniences including hacking seconds, quick-set dual calendar functionality, and smooth manual-winding capability.
• Architectural ""8090"" Grammar of Design Case Geometry: The reference 5606-8090 is globally distinguished among vintage Seiko collectors for its crisp execution of Taro Tanaka's ""Grammar of Design"" principles. Executed in solid stainless steel, the case features sharp angular facets, bold sweeping lugs, and zero-distortion mirror-polished Zaratsu planes that allow the low-profile mechanical timepiece to sit completely flush against the wrist.
• Masterful ""Weekdater"" Dial Harmony and Bilingual Utility: The dial of the 5606-8090 showcases exemplary mid-1970s visual balance, featuring a radiant silver sunburst 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, 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 5606-8090 23-jewel Lord Matic Weekdater remains a highly coveted, universally respected cornerstone reference for serious vintage Seiko collectors worldwide. Capturing the exact historical moment where Suwa Seikosha perfected high-utility automatic daily instruments right before the global industry shifted toward digital quartz technology, it stands as an eternal testament to 1970s Japanese horological design.

For more information, please look at the pictures.

Notes

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