Ball Watch Springlock Hairspring Protection

Ball SpringLOCK

Ball SpringLOCK is a patented shock protection device that acts as a cage around the hairspring, protecting it from jolts and impacts.

Improved Accuracy:

According to Ball, vibrations and shocks can account for a loss of up to 60 seconds per day for a mechanical watch movement. SpringLOCK is claimed to reduce this deviation in accuracy by up to 66%.

In Ball Watch Company’s own words:

“Disorient of balance-spring upon shock impact is the most common cause of watch inaccuracy. SpringLOCK®, the world’s first revolutionary and BALL’s patented anti-shock system, enhances watch accuracy by reducing balance-spring’s shock impact by 66%.”

Ball Calibers with SpringLOCK:

We have found movements featuring this technology with the letters -CSL after the caliber number. The C is for chronometer, SL is for SpringLOCK. Not sure if they have simply -SL movements without the C (comment below if you know more about this), but since this device is supposed to improve accuracy, it makes sense that it is used in the chronometer grade movements.


Additional Resources:

Seagull Caliber St19

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