Seiko Cal. 3817 - 331

The 3817-331 is a sought-after Automatic piece from Seiko's golden era. It features a White dial protected by a Hardlex crystal and offers 130m of water resistance. [seikata-wm-a21aa7800d11]

Also known as: UFO, Baby Tuna

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

15.1mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

130m

Dial Color

White

Jewels

20j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1978

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