Seiko Cal. 3870 - 731

The Seiko 3870-731 represents an important milestone in Seiko's 1966 lineup. Powered by the 3870 caliber with 27j jewels beating at 36,000 bph, it delivers a 66 hours power reserve. [seikata-wm-4ab3a3399be8]

Also known as: Golden Tuna, Flighty

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

12.2mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

180m

Dial Color

Green

Jewels

27j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1966

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