Seiko Cal. 3851 - 381

The 3851-381 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3851 caliber with 25j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-b42f42839a04]

Also known as: Tuna, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

36mm

Case Thickness

11.2mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Navy

Jewels

25j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1990

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