Seiko Cal. 3891 - 987

Seiko 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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