Seiko Cal. 6640 - 258

The Seiko 6640-258 represents an important milestone in Seiko's 1998 lineup. Powered by the 6640 caliber with 28j jewels beating at 36,000 bph, it delivers a 43 hours power reserve. [seikata-wm-0b762ac11c37]

Also known as: Samurai, Bullhead

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

41mm

Case Thickness

9.8mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Burgundy

Jewels

28j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1998

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