Seiko Cal. 6657 - 921

The Seiko 6657-921 represents an important milestone in Seiko's 1976 lineup. With its 19mm lug width and 11.7mm profile, it sits comfortably on most wrists. [seikata-wm-a60f769293f7]

Also known as: Rally

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

11.7mm

Lug Width

19mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

150m

Dial Color

Champagne

Jewels

30j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1976

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