Seiko Cal. 3813 - 850

The Seiko 3813-850 represents an important milestone in Seiko's 1975 lineup. Powered by the 3813 caliber with 34j jewels beating at 21,600 bph, it delivers a 47 hours power reserve. [seikata-wm-a460ad03e240]

Also known as: Sportsmatic, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

10.4mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Black

Jewels

34j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1975

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