Seiko Cal. 4431 - 935

The Seiko 4431-935 represents an important milestone in Seiko's 1965 lineup. Powered by the 4431 caliber with 23j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-8425cc3b7b80]

Also known as: Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

12.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Champagne

Jewels

23j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1965

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