Seiko Cal. 6657 - 931

This Spring Drive model from 1984 features a 46mm Two-Tone case. With its 20mm lug width and 9.6mm profile, it sits comfortably on most wrists. [seikata-wm-4b57c638337b]

Also known as: Sumo, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

46mm

Case Thickness

9.6mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

150m

Dial Color

Black

Jewels

29j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1984

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