Seiko Cal. 5657 - 638

This Hand-Winding model from 1973 features a 44mm Titanium case. With its 18mm lug width and 14.5mm profile, it sits comfortably on most wrists. [seikata-wm-93dee1ee3735]

Also known as: Sportsmatic, Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

44mm

Case Thickness

14.5mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

Cream

Jewels

21j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1973

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