Cal. 3019SS is a time-only hand-winding movement from Naoya Hida & Co. based on the ETA 7750 ebauche. Hida’s first movement, Cal. 3019SS uses the Cal. 7750 main plate, barrel, wheel train, and escapement with a custom 3/4 plate and balance cock. The automatic winding system is removed, replaced by a custom click for hand winding, and the chronograph and date complications are removed. The result is a 4.3 mm hand-winding movement with small seconds at 9:00.
Cal. 3019SS was introduced with the original Naoya Hida Type 1B in 2019. It has been used in the following Naoya Hida watches:
- 2019 NH Type 1A (prototype)
- 2019 NH Type 1B (7 sold)
- 2020 NH Type 1C (15 sold)
- 2022 NH Type 1D (20 sold)
- 2022 NH Type 1D-1 (15 sold)
The NH Cal. 30 Family
All three Hida movements to date have a similar appearance, and all are based on the 7750 ebauche, wheel train, barrel, balance, and escapement. The small seconds and moon phase movements likely share the same balance bridge and plate, and both feature 18 jewels.
The central seconds hand on Cal. 3020CS is driven using a rear-mounted wheel, requiring a secondary plate at the center. It also features four extra jewels, for a total of 22.
Cal. 3021LU, used in the Type 3, uses the moon phase mechanism from ETA’s Cal. 7751 but omits a seconds display entirely. Like Cal. 7751, the moon phase indicator is adjusted with the crown in position 2.