Seiko Cal. 6331 - 408

The Seiko 6331-408 represents an important milestone in Seiko's 1968 lineup. The Bidirectional bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-037f3b9237c0]

Also known as: Monster, UFO

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

40mm

Case Thickness

9.9mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Black

Jewels

33j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1968

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