Seiko Cal. 3891 - 987

The Seiko 3891-987 represents an important milestone in Seiko's 1997 lineup. Powered by the 3891 caliber with 33j jewels beating at 28,800 bph, it delivers a 49 hours power reserve. [seikata-wm-17aa7d1bc643]

Also known as: UFO, Sportsmatic

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

12.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Navy

Jewels

33j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1997

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