Seiko Cal. 4431 - 740

Seiko 4431-740

The 4431-740 is a sought-after Solar piece from Seiko's golden era. Powered by the 4431 caliber with 21j jewels beating at 36,000 bph, it delivers a 63 hours power reserve. [seikata-wm-71fac9c8193f]

Also known as: UFO, Rally

Specifications

Movement
Solar
Case Material
Two-Tone
Case Width
45mm
Case Thickness
13.5mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
40m
Dial Color
Cream
Jewels
21j
Frequency
36,000 bph
Power Reserve
63 hours
Year
1985

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