Seiko Cal. 3813 - 678

This Automatic model from 1981 features a 40mm PVD Black case. It features a Blue Sunburst dial protected by a Mineral crystal and offers 200m of water resistance. [seikata-wm-48d6efddba97]

Also known as: World Timer, Sea Horse

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

40mm

Case Thickness

11.7mm

Lug Width

22mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

25j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1981

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