Vintage 1969 JAPAN SEIKO 51 PRESMATIC WEEKDATER 5146-7000 27Jewels Automatic.

Vintage 1969 JAPAN SEIKO 51 PRESMATIC WEEKDATER 5146-7000 27Jewels Automatic.

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

Item description

Movement :

• Pet name : 51 SEIKO PRESMATIC WEEKDATER .
• Caliber number : 5146A.
• Movement : Automatic.
• Beat rate : 28800bph.
• Year of manufacture start : 1969's.
• Factory : Kameido.

Externals :

• Serial number : 970728.
• Dial number : JAPAN 5146-7000R.
• Glass : Acrylic.
• Case size : About 40.5mm.
• Lug width : 18mm.
• Band : Wrist size that can be worn is Up to about 192mm.

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.
• For practical, everyday use, it would be advisable to have the movement cleaned and oiled.

Key Features

The Milestone of Late-60s Executive Innovation (1969): In **1969**—a monumental historic year highlighted by global technological breakthroughs and Japan's peak post-war industrial confidence—the **Seiko 51 Presmatic** represented the absolute pinnacle of mid-century technical elegance. Born from the legendary **Daini Seikosha (Kameido)** factory under reference **5146-7000**, this upscale model was explicitly drawn for the nation's rising executive class. Positioned to deliver chronometer-level performance, it offered ambitious Showa-era business leaders unparalleled mechanical prestige and distinctive micro-engineering flair.

The Magnificent 27-Jewel Caliber 5146 High-Beat Heart: This watch is powered by the highly advanced **27-jewel Caliber 5146**, a premium in-house automatic movement operating at a swift high-beat frequency of **28,800 vibrations per hour (8 beats per second)**. Highly revered by vintage horological purists for its exceptionally slim architecture and robust build quality, this caliber tames gear-train friction by deploying a luxurious **27-jewel specification**. It integrates a smooth sweeping seconds configuration alongside an advanced **seconds-hacking mechanism** for precise time setting.

The Revolutionary Hexagonal Press-Crown Quick-Set Mechanism: The defining characteristic of the 51 Presmatic line is its namesake, highly advanced **""Presmatic"" date quick-set feature**. Built with an ingenious hexagonal time-setting crown that integrates an independent, spring-loaded center push-button, the user could instantly advance the inner date disk forward by one day by simply depressing the center of the crown. The dial houses a beautifully framed dual-calendar window at 3 o'clock featuring a **bilingual (English/Kanji) day disk**, prioritizing instant split-second legibility.

A Sovereign Cornerstone of Kameido's Automatic Legacy: Manufactured in the milestone mechanical year of **1969**, the 5146-7000 27-jewel variant remains a highly coveted, investment-grade reference for serious collectors worldwide. It represents the perfect historical intersection where rugged daily durability met late-1960s sharp case finishing and elite high-frequency micro-engineering right before the quartz transition. Built to an uncompromising heirloom standard, it stands as a profound testament to an era when Kameido perfected the high-utility daily business instrument.

For more information, please look at the pictures.

Notes

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