Seiko Cal. 4428 - 103

The 4428-103 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4428 caliber with 24j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-b4ce39c8567c]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

44mm

Case Thickness

12.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

110m

Dial Color

White

Jewels

24j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1986

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