Seiko Cal. 5657 - 273

This Spring Drive model from 1977 features a 38mm Hardlex-Coated Steel case. With its 20mm lug width and 10.1mm profile, it sits comfortably on most wrists. [seikata-wm-6bb40d1e69ad]

Also known as: Tuna, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

10.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

80m

Dial Color

Navy

Jewels

18j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1977

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