Seiko Cal. 5681 - 730

The Seiko 5681-730 represents an important milestone in Seiko's 1971 lineup. Powered by the 5681 caliber with 36j jewels beating at 28,800 bph, it delivers a 54 hours power reserve. [seikata-wm-480fc218a648]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

37mm

Case Thickness

13.9mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Cream

Jewels

36j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1971

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