Seiko Cal. 3871 - 639

The Seiko 3871-639 represents an important milestone in Seiko's 1997 lineup. Powered by the 3871 caliber with 23j jewels beating at 36,000 bph, it delivers a 50 hours power reserve. [seikata-wm-f3fdc904ac86]

Also known as: Turtle, UFO

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

15.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Black

Jewels

23j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1997

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