Seiko Cal. 4428 - 777

The Seiko 4428-777 represents an important milestone in Seiko's 1970 lineup. It features a White dial protected by a Mineral crystal and offers 180m of water resistance. [seikata-wm-3127e86bed2a]

Also known as: Helmet, Silverwave

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

10.1mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

180m

Dial Color

White

Jewels

27j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1970

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