Seiko Cal. 3813 - 637

The Seiko 3813-637 represents an important milestone in Seiko's 1983 lineup. It features a Silver dial protected by a Hardlex crystal and offers 170m of water resistance. [seikata-wm-f9b1ee8a1b21]

Also known as: Shogun, Tuna

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

39mm

Case Thickness

15.8mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Silver

Jewels

27j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1983

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