Seiko Cal. 6657 - 370

The Seiko 6657-370 represents an important milestone in Seiko's 1967 lineup. With its 18mm lug width and 14.1mm profile, it sits comfortably on most wrists. [seikata-wm-f26d3dae5ab1]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

38mm

Case Thickness

14.1mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

White

Jewels

27j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1967

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