Seiko Cal. 3898 - 670

This Spring Drive model from 1986 features a 37mm Hardlex-Coated Steel case. Powered by the 3898 caliber with 34j jewels beating at 21,600 bph, it delivers a 39 hours power reserve. [seikata-wm-7684ef1836f7]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

15.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Black

Jewels

34j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1986

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