Vintage 1971 JAPAN SEIKO LORD MATIC WEEKDATER 5606-5000 23Jewels Automatic.

Vintage 1971 JAPAN SEIKO LORD MATIC WEEKDATER 5606-5000 23Jewels Automatic.

Welcome to my auction!

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 No. : 171220.
• Dial No. : JAPAN 5606-5030T.
• Glass : Acrylic.
• Case size : About 31.63mm.
• Lug width : 20mm.
• 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 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 Early-70s Geometric Executive Design (1971): Manufactured in 1971—a landmark historical year during Japan's mature post-war economic boom and peak mechanical dominance—the Seiko Lord Matic Weekdater reference 5606-5000 represented Suwa Seikosha's daring avant-garde business flagship. Positioned directly beneath King Seiko, this reference broke away from conventional round profiles to offer corporate leaders chronometer-adjacent mechanical precision wrapped in modern square/geometric Showa architecture.
• The Over-Engineered 23-Jewel Caliber 5606 Automatic Heart: Powering this historic instrument is the celebrated 23-jewel Caliber 5606, an in-house automatic engine operating at a smooth frequency of 21,600 vibrations per hour (vph). Highly respected by vintage purists for its remarkably ultra-thin profile and long-term daily stability, this movement deploys a 23-jewel specification to minimize gear-train friction, complete with hacking seconds, quick-set dual calendar control, and smooth manual-winding capability.
• Architectural ""5000"" Square TV-Case Grammar of Design: The reference 5606-5000 is globally recognized among vintage collectors for its distinct, bold square case geometry executing Taro Tanaka's ""Grammar of Design"" principles in an angular format. Executed in solid stainless steel, the case combines broad brushed upper surfaces with razor-sharp mirror-polished Zaratsu chamfers along the perimeter, allowing the low-profile case to sit with commanding wrist presence while sliding effortlessly under a formal shirt cuff.
• Masterful Square Dial Symmetry and Bilingual Calendar Utility: The dial of the 5606-5000 showcases exemplary early-1970s layout balance, featuring a clean canvas adorned with hand-applied, multifaceted rectangular block indices and matching sharp hands. Symmetrically framed at 3 o'clock, the dual-calendar aperture houses a bilingual (English/Kanji) day disk alongside a quick-set date wheel, proudly offset by the applied metal ""LM"" emblem and the Suwa Seikosha swirl insignia above 6 o'clock.
• An Investment-Grade Masterpiece of Suwa's Geometric Heritage: Produced during the milestone mechanical year of 1971, the 5606-5000 23-jewel Lord Matic Weekdater stands as an exceptionally collectible reference for serious vintage Seiko connoisseurs worldwide. Capturing the precise era where Suwa Seikosha boldly merged ultra-thin automatic watchmaking with iconic early-1970s TV-dial architecture, it remains an eternal treasure of Japanese horological history.

For more information, please look at the pictures.

Notes

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