Seiko Cal. 6331 - 766

The Seiko 6331-766 represents an important milestone in Seiko's 1978 lineup. It features a Green dial protected by a Sapphire crystal and offers 50m of water resistance. [seikata-wm-f97f00f67b44]

Also known as: Helmet, Sea Horse

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

36mm

Case Thickness

11.9mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Green

Jewels

23j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1978

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