Seiko Cal. 6657 - 137

The Seiko 6657-137 represents an important milestone in Seiko's 1972 lineup. With its 18mm lug width and 12.5mm profile, it sits comfortably on most wrists. [seikata-wm-6ebc1d2d7c35]

Also known as: Sumo, Bellmatic

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

42mm

Case Thickness

12.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

110m

Dial Color

Burgundy

Jewels

18j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1972

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