Seiko Cal. 6644 - 937

The 6644-937 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6644 caliber with 21j jewels beating at 28,800 bph, it delivers a 52 hours power reserve. [seikata-wm-eb5ecebfefb0]

Also known as: Sumo, Bullhead

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

42mm

Case Thickness

11.4mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

170m

Dial Color

Silver

Jewels

21j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1992

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