Seiko Cal. 3891 - 187

The 3891-187 is a sought-after Automatic piece from Seiko's golden era. Powered by the 3891 caliber with 25j jewels beating at 21,600 bph, it delivers a 53 hours power reserve. [seikata-wm-31c35582a4dd]

Also known as: Tuna, Flighty

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

45mm

Case Thickness

9.1mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

170m

Dial Color

Cream

Jewels

25j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1966

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