Seiko Cal. 6657 - 421

This Spring Drive model from 1991 features a 42mm Two-Tone case. With its 18mm lug width and 8.4mm profile, it sits comfortably on most wrists. [seikata-wm-c867c5a5b0f1]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

42mm

Case Thickness

8.4mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Champagne

Jewels

31j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1991

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