Seiko Cal. 3891 - 187

The Seiko 3891-187 represents an important milestone in Seiko's 1972 lineup. Powered by the 3891 caliber with 25j jewels beating at 28,800 bph, it delivers a 54 hours power reserve. [seikata-wm-23d3d47d00f6]

Also known as: Shogun, Golden Tuna

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

13.4mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

70m

Dial Color

Navy

Jewels

25j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1972

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