Seiko Cal. 4431 - 340

The 4431-340 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4431 caliber with 35j jewels beating at 21,600 bph, it delivers a 72 hours power reserve. [seikata-wm-c919d93c9878]

Also known as: Sportsmatic, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

10.5mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

30m

Dial Color

Champagne

Jewels

35j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1988

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