Seiko Cal. 3896 - 663

This Spring Drive model from 1978 features a 37mm Hardlex-Coated Steel case. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 130m of water resistance. [seikata-wm-556da8f50e59]

Also known as: Sumo, Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

11.1mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Blue Sunburst

Jewels

17j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1978

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