Vintage 1975 JAPAN SEIKO LORD MATIC WEEKDATER 5606-8061 23Jewels Automatic.

Vintage 1975 JAPAN SEIKO LORD MATIC WEEKDATER 5606-8061 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. : 5N0430.
• Dial No. : JAPAN 5606-8090Ｔ.
• Glass : Crystal.
• Case size : About 36.3mm.
• Lug width : 18mm.
• Band : Wrist size that can be worn is Up to about 189mm.

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 Elegance (1975): Manufactured in 1975—a landmark historical era marking the mature mechanical peak of the late Showa period—the Seiko Lord Matic Weekdater reference 5606-8061 represented Suwa Seikosha's quintessential business-class flagship. Positioned directly beneath King Seiko, this late-series LM reference delivered chronometer-adjacent mechanical precision paired with an evolved, refined case profile designed for corporate sophistication.
• 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 architecture and long-term daily stability, this movement deploys a lavish 23-jewel specification to minimize gear-train friction, complete with hacking seconds, quick-set dual calendar control, and smooth manual-winding capability.
• Architectural ""8061"" Grammar of Design Case Geometry: The reference 5606-8061 is celebrated among vintage collectors for its flowing, ergonomic stainless steel case executing Taro Tanaka's ""Grammar of Design"" principles in an organic mid-70s silhouette. Featuring sweeping curved lug profiles, finely brushed upper surfaces, and razor-sharp mirror-polished Zaratsu chamfers along the flanks, the low-profile case rests completely flat against the wrist while sliding effortlessly beneath a tailored shirt cuff.
• Masterful ""Weekdater"" Dial Harmony and Bilingual Utility: The dial of the 5606-8061 displays exemplary mid-1970s layout balance, featuring a radiant finish accented by 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 vortex insignia above 6 o'clock.
• An Investment-Grade Masterpiece of Suwa's Automatic Heritage: Produced during the twilight of Seiko's classic mechanical golden age in 1975, the 5606-8061 23-jewel Lord Matic Weekdater stands as an exceptionally collectible reference for serious vintage Seiko connoisseurs worldwide. Capturing the precise era where Suwa Seikosha perfected ultra-thin executive automatic movements before the full transition to quartz, it remains an eternal treasure of Japanese horological history.

For more information, please look at the pictures.

Notes

• Before buying.
  The vintage watches we sell are inspected and adjusted so they work fine. However, since it is an vintage watch, Please purchase on the assumption that it will be repaired.
  
  
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