Seiko Cal. 5640 - 655

The Seiko 5640-655 represents an important milestone in Seiko's 1992 lineup. Powered by the 5640 caliber with 31j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-2a1ca74106e1]

Also known as: Samurai, Sumo

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

40mm

Case Thickness

14.5mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Navy

Jewels

31j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1992

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