Seiko Cal. 4431 - 217

The Seiko 4431-217 represents an important milestone in Seiko's 1967 lineup. The Coin-Edge bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-d52b08a696df]

Also known as: Sportsmatic, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

9.9mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Blue Sunburst

Jewels

28j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1967

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