Seiko Cal. 3870 - 937

This Spring Drive model from 1974 features a 41mm Titanium case. Powered by the 3870 caliber with 23j jewels beating at 36,000 bph, it delivers a 62 hours power reserve. [seikata-wm-58f2654be334]

Also known as: Monster, Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

41mm

Case Thickness

13.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Black

Jewels

23j

Frequency

36,000 bph

Power Reserve

62 hours

Year

1974

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