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This is a genuine Seiko original 24‑hour wheel for the VK63 movement, located under the dial at the 3 o’clock position, driving the permanent 24‑hour sub‑dial hand. The wheel works with a 12:1 reduction ratio linked to the hour wheel to indicate AM/PM. When the original wheel is worn, broken, or bent, causing the sub‑dial hand to stop or jump, replacing it with this OEM part is the direct solution.
Genuine quality: Factory‑produced by Seiko (TMI) Japan, brand new, fully compliant with original material and precision standards.
Compatible movement: Seiko VK63, VK63A (Meca‑quartz chronograph movement).
Location: Under the 3 o‘clock sub‑dial (permanent 24‑hour indicator).
Core function: Meshes with the hour wheel to convert each 12‑hour rotation of the hour hand into one full rotation of the 24‑hour hand, indicating AM/PM.
Repair value: When the 24‑hour hand stops, runs irregularly, jumps, or does not move at all, this wheel is often the cause and must be replaced.
Q1: Does this 24‑hour wheel relate to the chronograph function?
A: No. The 3 o‘clock sub‑dial is a permanent 24‑hour indicator (AM/PM) and is independent of the chronograph seconds, minutes, or hour counters. The VK63’s chronograph function uses the center seconds hand and the 9 o‘clock and 6 o’clock sub‑dials.
Q2: Will the sub‑dial hand automatically align after replacing the 24‑hour wheel?
A: No. After installing the new wheel and hand, you must synchronise the hand manually. Set the hour hand to 12 o‘clock (midnight); at that moment the 24‑hour hand should also point to 24. Press the hand on in that position.
Q3: Is this gear metal or plastic?
A: The 24‑hour wheel in the VK63 is typically a precision plastic gear. Some early versions may be metal. This product follows original factory specifications, matching the original material.
Q4: If the 24‑hour wheel is damaged, will it affect other hands?
A: If a tooth breaks off, debris may fall into the wheel train and affect other gears. If the wheel is merely stuck (e.g., a bent pivot), it usually only affects the 24‑hour hand itself, but the debris must still be cleaned during repair.
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