Seiko Cal. 3813 - 163

The Seiko 3813-163 represents an important milestone in Seiko's 1968 lineup. Powered by the 3813 caliber with 26j jewels beating at 36,000 bph, it delivers a 41 hours power reserve. [seikata-wm-66bdc8b6d237]

Also known as: Tuna, Helmet

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

37mm

Case Thickness

12.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

180m

Dial Color

Silver

Jewels

26j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1968

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