Seiko Cal. 3813 - 931

The Seiko 3813-931 represents an important milestone in Seiko's 1978 lineup. Powered by the 3813 caliber with 17j jewels beating at 28,800 bph, it delivers a 72 hours power reserve. [seikata-wm-56efcd699718]

Also known as: Tuna, Navigator

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

35mm

Case Thickness

8.9mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Green

Jewels

17j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1978

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