Seiko Cal. 4431 - 860

The Seiko 4431-860 represents an important milestone in Seiko's 1974 lineup. Powered by the 4431 caliber with 35j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-5c1b74f99b73]

Also known as: UFO, Arnie

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

38mm

Case Thickness

13.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

180m

Dial Color

Black

Jewels

35j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1974

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