Vintage 2005 JAPAN GRAND SEIKO 8J56-8020 7Jewels Quartz.

Vintage 2005 JAPAN GRAND SEIKO 8J56-8020 7Jewels Quartz.

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

Item description

Movement :

• Pet name : GRAND SEIKO.
• Caliber number : 8J56A
• Movement : Quartz.
• Year of manufacture start : 1998's.
  Externals :
  • Serial number : 5D0131.
  • Dial number : JAPAN 8J56-8030 T 4.
  • Glass : Crystal.
  • Case size : About 38.9mm.
  • Lug width : 19mm.
  • Band : Wrist size that can be worn is up to about 195mm.
  Condition :
  • Used, it runs well. Battery replaced
  • Quick set(Day/Date) : Okay.
    Set of the date : The set at one stage pulling the crown.
  • Approximate watch rate at Japan : Quartz.
  • For practical, everyday use, it would be advisable to have the movement cleaned and oiled.
  • Grand Seiko box and link included.
  Key Features
  Modern Grand Seiko Quartz Era: Produced around **2005**, this watch belongs to the modern period where Grand Seiko prioritized **High-Accuracy Quartz (HAQ)** movements. This strategy aimed to produce the highest quality quartz timepieces globally, distinct from standard quartz watches.

  The High-Grade 8J56 Caliber: The watch is powered by the **Caliber 8J56**, a 7-jewel, **thermo-compensated** quartz movement. The movement is specified for extremely high annual accuracy, typically **$\pm10$ seconds per year (SPY)**, achieved through highly efficient circuitry and temperature stabilization.

  Independent Hour Hand: A critical feature designed for practicality is the **independently adjustable hour hand**. This allows the wearer to quickly change time zones or adjust for Daylight Saving Time without stopping the minute or second hand, thereby preserving the movement's exceptional accuracy rating.

  Jewel Count Variation: The presence of **7 Jewels** indicates superior internal finishing and reduced friction at critical gear train points, even exceeding the standard 5-jewel variant sometimes seen, underscoring the high-quality assembly of the 8J series.

  Design and Aesthetics: The reference **8J56-8020** adheres to the timeless **Grand Seiko Style**, characterized by multi-faceted Zaratsu-polished hands and markers, ensuring flawless legibility and a simple, elegant aesthetic that reflects the watch's commitment to pure precision.

For more information, please look at the pictures.

Notes

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