Seiko Cal. 4428 - 997

Released in 1968, the Cal. 4428 with design code 997 was part of Seiko's domestic market collection. It features a White dial protected by a Hardlex crystal and offers 90m of water resistance. [seikata-wm-2a5ff2092fd2]

Also known as: Sumo, Sea Horse

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

8.6mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

White

Jewels

31j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1968

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