Seiko Cal. 5640 - 837

Released in 1992, the Cal. 5640 with design code 837 was part of Seiko's domestic market collection. It features a Black dial protected by a Hardlex crystal and offers 190m of water resistance. [seikata-wm-6febead71dad]

Also known as: Sumo

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

39mm

Case Thickness

12.9mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

190m

Dial Color

Black

Jewels

26j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1992

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