Seiko Cal. 5657 - 840

The Seiko 5657-840 represents an important milestone in Seiko's 1988 lineup. Powered by the 5657 caliber with 19j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-5f44b44fe1ba]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

42mm

Case Thickness

10.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

19j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1988

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