Seiko Cal. 4430 - 640

The 4430-640 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4430 caliber with 26j jewels beating at 28,800 bph, it delivers a 70 hours power reserve. [seikata-wm-53c08697d235]

Also known as: Flighty

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

10.1mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

80m

Dial Color

White

Jewels

26j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1977

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