Seiko Cal. 3811 - 778

This Spring Drive model from 1970 features a 35mm Hardlex-Coated Steel case. The Rotating bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-feafe6add247]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

11.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

120m

Dial Color

Green

Jewels

28j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1970

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