Seiko Cal. 4428 - 857

The Seiko 4428-857 represents an important milestone in Seiko's 1986 lineup. Powered by the 4428 caliber with 25j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-535b0e2855ba]

Also known as: Helmet, UFO

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

9.7mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Green

Jewels

25j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1986

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