6L37

The thin, high-performance 6L37 movement is the result of more than 100 years of heritage and technical transmission.

 

The 6L37 caliber is SEIKO's thinnest automatic mechanical movement ever.
While meeting the strict SEIKO Divers standards, it is equipped with a duration of more than 45 hours and high precision with an average day difference of +15 to -10 seconds.

Seiko's original technology

SPRON

SPRON is a Seiko original alloy. Used for the mainspring and hairspring, it was developed to be resistant to tear, corrosion, and wear. The 6L37’s use of this special alloy makes the caliber long-lasting with stable precision.

Diashock

Diashock is a structure developed to enhance the movement’s resistance to shocks. It is used as a bearing, such as for the balance wheel pivot, a section of the movement that is especially sensitive to shocks and jolts. With Diashock, the structure maintains high stability even when subjected to sudden shocks.

Caliber 6L37
Driving system：Automatic
Frequency：28,800 vibrations per hour（8 beats per second）
Precision：+15 to -10 seconds per day
Power reserve：45 hours
Number of jewels：26