Seiko Cal. 5657 - 640

This Solar model from 1970 features a 46mm Titanium case. With its 18mm lug width and 14.9mm profile, it sits comfortably on most wrists. [seikata-wm-9d0741a8a50c]

Also known as: UFO, Navigator

Specifications

Movement

Solar

Case Material

Titanium

Case Width

46mm

Case Thickness

14.9mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

50m

Dial Color

Green

Jewels

35j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1970

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