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The SEIKO (SII) NH05/NH06 Hour Wheel is a genuine Japanese-made component for these compact 7¾”’ automatic movements. As a core part of the motion work, the hour wheel drives the hour hand for accurate time display, working in conjunction with the minute wheel and cannon pinion. The NH05 features a date display while the NH06 adds a day-date complication, but both share the same basic hour wheel architecture. This brand new original part is essential for watchmakers restoring proper timekeeping function when the original component becomes worn or damaged.
Genuine Seiko/SII part – authentic Japanese-made component for NH05 and NH06 movements
Motion work component – drives the hour hand for accurate time display
NH0 family compatibility – designed for the compact 7¾”’ NH05 (date) and NH06 (day-date) calibers
21-jewel movement – part of the 21-jewel NH0 series architecture
Direct replacement – drop-in replacement for worn or damaged hour wheels
Compatible Movements: Seiko NH05 (date), NH06 (day-date)
Movement Family: NH0 Series
Movement Size: 7¾”’ (approx. 17.5mm)
Movement Height: 5.92mm
Jewels: 21
Frequency: 21,600 vph (3 Hz)
Power Reserve: >40 hours
Hand Sizes: Hour: 1.10mm / Minute: 0.65mm / Seconds: 0.21mm
Crown Positions: Normal (manual winding), 1st click (date/day setting), 2nd click (time setting)
Origin: Japan
Service and overhaul – replacing worn or damaged hour wheels in NH05/NH06 movements
Motion work restoration – ensuring smooth and accurate hand alignment
Suitable for professional watchmakers and experienced repair technicians
1. Is this a genuine Seiko/SII part?
Yes, this is a genuine Seiko (SII/TMI) factory part made in Japan. The NH05 and NH06 are manufactured by Seiko Instruments Inc. (SII) and distributed by Time Module Inc. (TMI).
2. Which movements is this hour wheel compatible with?
This hour wheel is designed for Seiko NH05 and NH06 movements. The NH05 features a date display, while the NH06 adds a day-date complication, but both share the same basic movement architecture and motion work.
3. What are the signs that the hour wheel needs replacement?
Common signs include hour hand not advancing correctly, misalignment between hour and minute hands, or visible wear/damage during inspection. A qualified watchmaker can diagnose these issues.
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