Seiko Cal. 5640 - 642

The 5640-642 is a sought-after Quartz piece from Seiko's golden era. Powered by the 5640 caliber with 20j jewels beating at 36,000 bph, it delivers a 68 hours power reserve. [seikata-wm-2f5b3ffbc656]

Also known as: Shogun, Sportsmatic

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

9.7mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Black

Jewels

20j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1998

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