Seiko Cal. 4439 - 912

The 4439-912 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4439 caliber with 24j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-cf9bb1adde11]

Also known as: Monster, UFO

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

11.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Cream

Jewels

24j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1985

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