Vintage 1969 JAPAN SEIKO SEIKOMATIC-P WEEKDATER 5106-8020 33Jewels Automatic.

Vintage 1969 JAPAN SEIKO SEIKOMATIC-P WEEKDATER 5106-8020 33Jewels Automatic.

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

Item description

Movement :

• Pet name : 51 SEIKOMATIC-P WEEKDATER .
• Caliber No. : 5106A.
• Movement : Automatic.
• Beat rate : 19800bph.
• Year of manufacture start : 1967's.
• Factory : Kameido.

Externals :

• Serial No. : 970878.
• Dial No. : JAPAN 5106-8031T.
• Glass : Crystal.
• Case size : About 38.83mm.
• Lug width : 18mm.
• Band : New Leather Strap.

Condition :

• Used, it runs well.
• Quick set(Day/Date) : Okay.
  Set the day of the week : English only.
  Set the date: Iteration the hour hand at 8:00 to 12:00.
  Set of the date: Press 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 Late-60s Business Automatic Innovation (1968): Manufactured in 1968—a monumental year during Japan's mid-Showa industrial boom—the Seiko Seikomatic-P Weekdater reference 5106-8020 represented Daini Seikosha's technological masterwork in executive automatic horology. The ""P"" (Presmatic) designation signified a high-spec, feature-rich mechanical platform developed specifically to rival Suwa Seikosha's top-tier business lines.
• The Over-Engineered 33-Jewel Caliber 5106 Presmatic Engine: Powering this historic instrument is the ultra-sophisticated 33-jewel Caliber 5106A, an in-house automatic engine operating at a frequency of 19,800 vibrations per hour (vph). Featuring an extravagant 33-jewel specification to eliminate gear-train friction, this movement is globally famous for its unique hexagonal central push-button crown, which allows instant quick-setting of the date disk by depressing the crown center, alongside hacking seconds and hand-winding capability.
• Architectural ""8020"" Grammar of Design Cushion Case: The reference 5106-8020 is globally distinguished among vintage Seiko collectors for its beautifully contoured cushion-style stainless steel case. Executed with sharp angular facets, broad brushed surfaces, and zero-distortion mirror-polished Zaratsu edge bevels inspired by Taro Tanaka's ""Grammar of Design"" guidelines, the case rests flush and ergonomically balanced against the wrist.
• Masterful ""Weekdater"" Dial Harmony and Fine Typography: The dial of the 5106-8020 showcases exemplary late-1960s visual balance, featuring a radiant silver sunburst canvas decorated with hand-applied, multifaceted rectangular block indices and sharp dauphine hands. Symmetrically framed at 3 o'clock, the dual-calendar aperture displays the day and date wheels, proudly adorned with applied ""SEIKOMATIC-P"" typography and the ""33 JEWELS"" designation.
• An Investment-Grade Masterpiece of Daini's Mechanical Heritage: Manufactured in the landmark mechanical year of 1968, the 5106-8020 33-jewel Seikomatic-P Weekdater remains a highly sought-after, universally respected reference for serious vintage Seiko collectors worldwide. Representing the absolute peak of Daini Seikosha's late-60s automatic engineering, it stands as an eternal heirloom 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.
  
  
• To prevent shipping accidents.
  Please monitor the tracking number until the item arrives and if it stagnates, please investigate at your country post office. Also, please confirm the item when you receive the item.
  
  
• About import taxes.
  Taxes such as import duties and VAT are not included in the item price or shipping charges, except for items shipped to the US. When you purchase, you will likely be required to pay these fees in your country.
  
  
• About Payment, Shipping, Return.
  Payment, Shipping, Return are in accordance with eBay's business policies.