At the heart of every PROTOS is the Seiko manufactured NH35A Automatic Movement. Thoroughly tested and proven as extremely reliable, the NH35A has 24 jewels, beats at 21,600 bph and has 41 hours power reserve. The most up to date of the 3 most widely used micro brand movements (the others being the Swiss ETA 2824 and Miyota 9015 movements), and is from the family of robust, reliable  movements made famous by Seiko over decades. Unlike its’ more expensive Swiss counterparts, the Japanese NH35A will demand little if any maintenance for the lifetime of your watch, ensuring years of accurate, reliable service.

Manufacturer: Seiko 
Caliber Number: NH35A 
Movement Type: Automatic 
Jewels: 24 
Vibrations Per Hour:21,600 bph
Power Reserve:41 hours 
Winding Direction: Bi-directional        Hacking: Yes 
Diameter: 27.40mm (outside) / 29.36mm(casing) 
Height: 5.32mm 
Country of Manufacture: Japan