Seiko Cal. 5671 - 639

The Seiko 5671-639 represents an important milestone in Seiko's 1969 lineup. Powered by the 5671 caliber with 21j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-2cd334f6eb31]

Also known as: UFO, Arnie

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

8.2mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1969

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