Seiko Cal. 5639 - 681

The Seiko 5639-681 represents an important milestone in Seiko's 1990 lineup. Powered by the 5639 caliber with 36j jewels beating at 36,000 bph, it delivers a 70 hours power reserve. [seikata-wm-9f7bba2d28b3]

Also known as: UFO

Specifications

Movement

Solar

Case Material

Titanium

Case Width

42mm

Case Thickness

12.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Burgundy

Jewels

36j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1990

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