Seiko Cal. 6681 - 689

The Seiko 6681-689 represents an important milestone in Seiko's 1972 lineup. Powered by the 6681 caliber with 34j jewels beating at 28,800 bph, it delivers a 71 hours power reserve. [seikata-wm-c1d5801ffd85]

Also known as: Sumo, Helmet

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

39mm

Case Thickness

15.6mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Silver

Jewels

34j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1972

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