The VK64 is a mecha-quartz chronograph movement made by Seiko Instruments Inc. (SII), a subsidiary of Seiko Group Corporation. It’s part of the Seiko VK series, which blends quartz accuracy with mechanical chronograph feel. Here's a breakdown of its functions, history, and origin:

FUNCTIONS OF THE VK64

The VK64 is a hybrid mecha-quartz movement, meaning it has quartz timekeeping but uses mechanical components for the chronograph. Key features include:

• Time display: Hours, minutes, central chronograph seconds

• Chronograph:

  • Central sweeping chronograph seconds hand (mecha-style "snap back" reset)

  • 60-minute chronograph counter at 9 o'clock

• 24-hour subdial at 3 o’clock

• Date display at 6 o’clock

• Hacking: Yes (seconds hand stops when setting the time)

• Battery life: Approx. 3 years (uses SR936SW)

• Accuracy: ±20 seconds/month (quartz-regulated)

HISTORY AND BACKGROUND

• The VK64 is part of the Seiko Hybrid Mechanical Quartz movement family, developed to offer a mechanical chronograph feel at a lower cost and with higher durability and accuracy than full mechanical chronographs.

• Seiko introduced the mecha-quartz concept in the 1980s, but the VK series gained wider popularity in the 2010s, especially in microbrand watches.

• It’s designed for affordable chronograph watches that want the tactile appeal of mechanical chronos without the cost and complexity.

WHO MAKES IT?

• Seiko Instruments Inc. (SII) manufactures the VK64 and other VK-series movements.

• SII is a major producer of quartz movements and components, and it supplies movements not only for Seiko watches but also for many third-party brands, particularly microbrands.

• The VK64 is widely available through movement suppliers and watch parts dealers, making it a go-to choice for independent and boutique watchmakers.

WHY IT’S POPULAR

• The sweeping chronograph seconds hand and instant reset give it the look and feel of a mechanical chronograph.

• Low maintenance, high accuracy, and compact size (13½ lignes / ~30mm diameter) make it easy to use and maintain.