Seiko Cal. 5639 - 234

The Seiko 5639-234 represents an important milestone in Seiko's 1970 lineup. The Inner Rotating bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-a24d74ce14a8]

Also known as: Tuna, UFO

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

43mm

Case Thickness

9.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Burgundy

Jewels

25j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1970

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