Seiko Cal. 4421 - 639

The Seiko 4421-639 represents an important milestone in Seiko's 1965 lineup. It features a Blue Sunburst dial protected by a Acrylic crystal and offers 130m of water resistance. [seikata-wm-c2ed06fb2cac]

Also known as: Bullhead

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

11.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1965

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