Seiko Cal. 6331 - 413

This Spring Drive model from 1987 features a 37mm Stainless Steel case. Powered by the 6331 caliber with 36j jewels beating at 28,800 bph, it delivers a 49 hours power reserve. [seikata-wm-e2cb16c26c4a]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

8.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Champagne

Jewels

36j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1987

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