Seiko Cal. 4428 - 698

This Hand-Winding model from 1986 features a 44mm PVD Black case. Powered by the 4428 caliber with 27j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-e1cf52052a97]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

44mm

Case Thickness

9.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Black

Jewels

27j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1986

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