Seiko Cal. 6647 - 739

The Seiko 6647-739 represents an important milestone in Seiko's 1965 lineup. With its 22mm lug width and 15.6mm profile, it sits comfortably on most wrists. [seikata-wm-67f0cacd2ad6]

Also known as: UFO, Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

42mm

Case Thickness

15.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Black

Jewels

26j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1965

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