Movement Specifications

 

1. Chronograph Models (Daytona Style)

Movement: Seiko Instruments (SII) Caliber VK63 (Mechaquartz)

  • Type: Hybrid Mechanical-Quartz (Battery powered with mechanical chronograph module)

  • Accuracy: +/- 20 seconds per month

  • Battery: Cell Number 394 / SR936SW

  • Battery Life: Approx. 3 years (normal operation)

  • Functions:

    • Central hours & minutes

    • Small seconds at 6:00

    • Chronograph: Central seconds hand & 60-minute counter at 9:00

    • 24-hour indicator at 3:00

    • Date window at 4:30

  • Note: The VK63 gives you the accuracy of quartz with the "snap-back" reset feel of a mechanical chronograph.

2. Automatic No-Date Models (Santos Style)

Movement: Seiko Instruments (SII) Caliber NH38

  • Type: Automatic Mechanical (Self-winding + Hand-winding)

  • Accuracy: -20 ~ +40 seconds per day (average)

  • Power Reserve: ~41 Hours

  • Jewels: 24 Jewels

  • Functions:

    • Central hours, minutes, and sweeping seconds.

    • True No-Date: No "phantom" crown position (only 2 positions: wind and set time).

    • Open balance wheel at 9:00 (visible on open-heart dials).

  • Description: A solid, no-frills workhorse movement widely respected by enthusiasts for its durability.

3. Automatic Date Models (Nautilus, Royal Oak, Datejust)

Movement: Seiko Instruments (SII) Caliber NH35

  • Type: Automatic Mechanical (Self-winding + Hand-winding)

  • Accuracy: -20 ~ +40 seconds per day (average)

  • Power Reserve: ~41 Hours

  • Jewels: 24 Jewels

  • Functions:

    • Central hours, minutes, and sweeping seconds.

    • Date display at 3:00 (Quick-set function).

    • Stop-second device ("Hacking") for precise time setting.

  • Description: The industry standard for automatic diver and dress watches. Known for being robust, reliable, and easily serviceable.

4. Automatic GMT Models (GMT Master II Style)

Movement: Seiko Instruments (SII) Caliber NH34

  • Type: Automatic GMT Mechanical

  • Accuracy: -20 ~ +40 seconds per day (average)

  • Power Reserve: ~41 Hours

  • Jewels: 24 Jewels

  • Functions:

    • Central hours, minutes, and sweeping seconds.

    • GMT Hand: Independent 24-hour hand to track a second time zone.

    • Date display at 3:00.

  • Description: A feature-rich movement that allows the wearer to track multiple time zones simultaneously.

5. Automatic Day-Date Models

  •  Movement: Automatic Day-Date Caliber (Typical for Day-Date Mods)

  • Type: Automatic Mechanical

  • Accuracy: -20 ~ +40 seconds per day

  • Power Reserve: ~40+ Hours

  • Functions:

    • Central hours, minutes, and sweeping seconds.

    • Day Display: Full panoramic day of the week at 12:00.

    • Date Display: Cyclops date window at 3:00.

  • Vibration Frequency: 21,600 bph