The Seiko VK63 movement in a Seiko mod

The VK63 combines quartz timekeeping with a mechanical chronograph mechanism. A battery powers the movement; the stopwatch is separate from the ordinary time display. Time Module (TMI) describes the VK series’ mechanical chronograph operation and direct reset to zero.

The TMI VK63 operating manual explains standard timing: button A starts and stops the chronograph; button B resets the chronograph hands to zero. The VK63 measures intervals up to 60 minutes.

TMI publishes these figures for the VK63A (specification sheet):

• Jewels: 0
• Accuracy: less than ±20 seconds per month within the normal temperature range
• Battery: SR936SW, life approximately 3 years assuming 60 minutes of chronograph operation per day
• Diameter: 30.80 mm
• Total height: 5.10 mm
• Chronograph: centre 1/5-second hand and minute counter
• Calendar: date with quick correction; stop-second when setting the time

Choose VK63 when you want a stopwatch and a battery-powered movement. An NH35 automatic is a mechanical movement with a date; NH34 adds a GMT hand for a second time zone. Those functions serve different uses. The NH35 guide and GMT/NH34 guide help you compare. Then consider the readability of the hands and subdials, case dimensions and bracelet.

The TONA MOD collection includes VK63 chronographs with different dials and bracelets. Compare the contrast between the dial, hands and subdials, then case dimensions and the offered variant. Panda describes a contrasting dial style; it does not specify a material or bracelet. The buying guide helps you choose a finished mod.

• Every watch comes with a 2-year warranty from delivery. It covers manufacturing defects and functional problems under normal use. It doesn't cover scratches, damage from opening the watch, or water damage.
• 10–12 days after ordering
• 14-day returns. The period starts on receipt. For deliveries to the UK, US and Australia, we offer 14-day returns.

14-day returns