Seiko Cal. 6231 - 320

The Seiko 6231-320 represents an important milestone in Seiko's 1977 lineup. Powered by the 6231 caliber with 31j jewels beating at 28,800 bph, it delivers a 72 hours power reserve. [seikata-wm-90a33c292d04]

Also known as: Sumo, Silverwave

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

8.4mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Burgundy

Jewels

31j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1977

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