Serviced Vintage 1970 JAPAN SEIKO PRESMATIC WEEKDATER 5146-7040 27J Automatic.

Vintage 1970 JAPAN SEIKO PRESMATIC WEEKDATER 5146-7040 27Jewels Automatic.

Welcome to my auction!

Item description

Movement :

• Pet name : 51 SEIKO PRESMATIC WEEKDATER .
• Caliber No. : 5146A.
• Movement : Automatic.
• Beat rate : 28800bph.
• Year of manufacture start : 1969's.
• Factory : Kameido.

Externals :

• Serial No. : 055119.
• Dial No. : JAPAN 5146-7070R.
• Glass : Crystal.
• Case size : About 36.37mm.
• Lug width : 18mm.
• Band : New Leather Strap of SEIKO original.

Condition :

• Used, it runs well.
• Quick set(Day/Date) : Okay.
  Set the day of the week : English only.
  Set of the days of the week : 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.
• Overhaul service in October 2026.
  The movement has been cleaned and oiled, so it works fine.

Key Features

• The Sovereign Peak of 1970 Kameido Executive Luxury (1970): Manufactured in 1970—a milestone historical year defined by the Osaka Expo '70 and Japan's peak post-war industrial supremacy—the Seiko 51 Presmatic Weekdater represented Daini Seikosha's flagship high-tech alternative to traditional luxury dress watches. Sourced under reference 5146-7040, this high-grade executive model sat directly below the King Seiko line, combining cutting-edge mechanical quick-set technology with bold, geometric Showa-era styling.
• The High-Beat 27-Jewel Caliber 5146 Automatic Heart: Powering this historic instrument is the magnificent 27-jewel Caliber 5146A, 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 for its lavish 27-jewel specification, this caliber minimized gear-train friction and incorporated advanced functionality including hacking seconds, hand-winding capability, and high chronometric stability.
• Revolutionary "Presmatic" Hexagonal Crown Push-Date Mechanism: A defining technological triumph of the 51-series movement was its iconic crown-center push button (Presmatic mechanism). By depressing the center button integrated inside the unique hexagonal crown, the wearer could instantly advance the date wheel with a crisp tactile feedback. This clever engineering eliminated the need for secondary case pushers while preserving sleek, water-resistant case lines.
• Architectural "7040" Cushion Case and Faceted Dial Geometry: The reference 5146-7040 is globally distinguished among vintage collectors for its robust, cushion-shaped case architecture featuring sharp, angular facets and sweeping broad shoulders inspired by Taro Tanaka's "Grammar of Design" principles. The radiant silver sunburst dial features hand-applied, multifaceted rectangular hour indices paired with razor-sharp hands. Symmetrically framed at 3 o'clock, the dual-calendar window houses a bilingual day disk alongside the quick-set date configuration.
• An Investment-Grade Masterpiece of Daini's Mechanical Legacy: Manufactured in the milestone mechanical year of 1970, the 5146-7040 27-jewel Presmatic remains one of the most historically significant, highly sought-after Daini references worldwide. It captures the exact historical moment where Kameido perfected high-beat automatic utility right before the industry shifted into quartz technology. Built to an uncompromising heirloom standard, it stands as an eternal testament to late-1960s and early-1970s Japanese horological design.

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.