Seiko Cal. 6657 - 937

The Seiko 6657-937 represents an important milestone in Seiko's 1977 lineup. With its 21mm lug width and 15.3mm profile, it sits comfortably on most wrists. [seikata-wm-9facfcfa8e10]

Also known as: Tuna

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

15.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

120m

Dial Color

Burgundy

Jewels

36j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1977

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