Seiko Cal. 4431 - 907

The Seiko 4431-907 represents an important milestone in Seiko's 1989 lineup. Powered by the 4431 caliber with 30j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-3dfbabaf0ece]

Also known as: Bullhead, Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

44mm

Case Thickness

14.2mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Champagne

Jewels

30j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1989

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