Seiko Cal. 4423 - 781

The Seiko 4423-781 represents an important milestone in Seiko's 1966 lineup. It features a Blue Sunburst dial protected by a Sapphire crystal and offers 100m of water resistance. [seikata-wm-603820e571cb]

Also known as: Baby Tuna, Emperor

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

44mm

Case Thickness

11.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1966

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