Serviced Vintage 1972 JAPAN SEIKO LORD MATIC SP 5206-6120 23J Automatic.

Serviced Vintage 1972 JAPAN SEIKO LORD MATIC SPECIAL WEEKDATER 5206-6120 23Jewels Automatic.

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

Item description

Movement :

• Pet name : 52 LORD MATIC SPECIAL WEEKDATER.
• Caliber number : 5206A.
• Movement : Automatic.
• Beat rate : 28800bph.
• Year of manufacture start : 1970's.
• Factory : Kameido.

Externals :

• Serial number : 2D0972.
• Dial number : JAPAN 5206-6040R.
• Glass : Crystal.
• Case size : About 34.93mm.
• Lug width : 14mm.
• Band : Wrist size that can be worn is Up to about 188mm.

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

Key Features

• The Sovereign Peak of 1972 Daini High-Beat Luxury (1972): Manufactured in 1972—a landmark historical year during Japan's peak post-war industrial supremacy—the Seiko Lord Matic Special Weekdater reference 5206-6120 represented Daini Seikosha's flagship tier of the Lord Matic lineup. Engineered in Kameido as a high-spec alternative to Suwa's 56-series, the ""Special"" designation signifies an elevated grade of high-beat movement finish and exceptional chronometric capability.
• The Over-Engineered High-Beat 23-Jewel Caliber 5206 Automatic Heart: Powering this historic instrument is the revered 23-jewel Caliber 5206A, an in-house automatic engine operating at a swift high-beat frequency of 28,800 vibrations per hour (8 beats per second). Highly celebrated by vintage purists, this caliber features hacking seconds, hand-winding capability, and a rare instantaneous day/date change mechanism that snaps crisply at midnight.
• Architectural ""6120"" Grammar of Design Case Geometry: The reference 5206-6120 is globally distinguished among collectors for its textbook 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, creating an aggressive yet refined silhouette that sits completely flush against the wrist.
• Masterful ""Special"" Dial Harmony and Bilingual Utility: The dial of the 5206-6120 showcases exemplary early-1970s visual balance, featuring a radiant silver sunburst canvas set 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 the date wheel, proudly adorned with the applied ""LM"" emblem, script ""Special"" branding, and Daini's lightning bolt symbol above 6 o'clock.
• An Investment-Grade Masterpiece of Kameido's High-Beat Legacy: Manufactured during the milestone year of 1972, the 5206-6120 23-jewel Lord Matic Special remains one of the most technically advanced and highly coveted Daini references worldwide. Capturing the precise moment where Kameido perfected high-beat daily instruments right before the full expansion of quartz technology, it stands as an eternal heirloom of Japanese horological innovation.

For more information, please look at the pictures.

Notes

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