Seiko Cal. 6357 - 640

The Seiko 6357-640 represents an important milestone in Seiko's 1982 lineup. Powered by the 6357 caliber with 27j jewels beating at 36,000 bph, it delivers a 41 hours power reserve. [seikata-wm-fc69730081e9]

Also known as: Sumo

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

44mm

Case Thickness

11.2mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1982

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