Seiko Cal. 6640 - 737

The Seiko 6640-737 represents an important milestone in Seiko's 1995 lineup. Powered by the 6640 caliber with 25j jewels beating at 28,800 bph, it delivers a 70 hours power reserve. [seikata-wm-2c9e804c68ed]

Also known as: Samurai, Shogun

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

39mm

Case Thickness

15.8mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Burgundy

Jewels

25j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1995

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