Seiko Cal. 0720 - 331

The Seiko 0720-331 represents an important milestone in Seiko's 1965 lineup. Powered by the 0720 caliber with 33j jewels beating at 36,000 bph, it delivers a 70 hours power reserve. [seikata-wm-0335bd98902c]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

10.2mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

100m

Dial Color

White

Jewels

33j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1965

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