Seiko Cal. 3891 - 642

The 3891-642 is a sought-after Automatic piece from Seiko's golden era. Powered by the 3891 caliber with 25j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-807ada89cfdb]

Also known as: Baby Tuna

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

15.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

Green

Jewels

25j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1989

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