Seiko Cal. 4428 - 381

Released in 1980, the Cal. 4428 with design code 381 was part of Seiko's domestic market collection. It features a Cream dial protected by a Mineral crystal and offers 30m of water resistance. [seikata-wm-2dc80ad5da83]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

15.9mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Cream

Jewels

22j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1980

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