MIYOTA/CITIZEN JS20 Second Wheel

Product Description

The MIYOTA/CITIZEN JS20 Second Wheel is a genuine Japanese-made component for the popular JS20 quartz chronograph movement . As part of the gear train, this wheel drives the chronograph seconds hand located at the 6 o’clock subdial, ensuring accurate elapsed time measurement . The JS20 is a 12½ ligne movement featuring a 30-minute chronograph function and a 24-hour indicator at 3 o’clock . This brand new original part is essential for watchmakers restoring proper chronograph function when the original component becomes worn or damaged.

Features & Function

• Genuine Miyota/Citizen part – authentic Japanese-made component for the JS20 movement 

• Chronograph module component – drives the stopwatch seconds hand at the 6 o’clock subdial for elapsed time measurement 

• 0-jewel movement – designed for the cost-effective JS20 quartz chronograph 

• Direct replacement – drop-in replacement for worn or damaged chronograph second wheels

Specifications

• Compatible Movement: MIYOTA/Citizen JS20 

• Movement Size: 12½ ligne (approx. 28.0mm) 

• Movement Thickness: 4.18mm 

• Chronograph Subdial Position: 6 o’clock (chronograph seconds register), 9 o’clock (chronograph minute register), 3 o’clock (24-hour indicator) 

• Hand Hole Sizes: 0.17mm (sweep seconds), 0.26mm (sub-hands) 

• Battery: 364 / SR621SW 

• Jewels: 0 

• Origin: Japan

Applications

• Service and repair – replacing worn or damaged chronograph second wheels in JS20 movements

• Chronograph function restoration – resolving issues with the 6 o’clock subdial seconds hand not resetting to zero or moving irregularly 

• Suitable for professional watchmakers and experienced repair technicians

FAQs

1. Is this a genuine Miyota/Citizen part?
Yes, this is a genuine Miyota (Citizen) factory part made in Japan. The JS20 is manufactured by Citizen’s Miyota movement division .

2. Which movement is this second wheel compatible with?
This second wheel is designed for the Miyota JS20 quartz chronograph movement. The JS20 features a chronograph seconds register at 6 o’clock, chronograph minute register at 9 o’clock, and a 24-hour indicator at 3 o’clock .

3. What is the function of the second wheel in the JS20?
The second wheel drives the chronograph seconds hand at the 6 o’clock subdial for elapsed time measurement. The JS20 stopwatch can measure up to 29 minutes and 59 seconds .

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