Seiko Cal. 6331 - 987

Released in 1969, the Cal. 6331 with design code 987 was part of Seiko's domestic market collection. With its 21mm lug width and 12.8mm profile, it sits comfortably on most wrists. [seikata-wm-fd7bd0a5b88d]

Also known as: Monster, Rally

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

12.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Green

Jewels

35j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1969

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