Seiko Cal. 6658 - 974

The Seiko 6658-974 represents an important milestone in Seiko's 1976 lineup. Powered by the 6658 caliber with 18j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-8538f2fc3d67]

Also known as: Sumo, Tuna

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

13.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Green

Jewels

18j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1976

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