Seiko Cal. 4431 - 340

Seiko 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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seikata-wm-c919d93c9878