Seiko Cal. 4423 - 550

The Seiko 4423-550 represents an important milestone in Seiko's 1969 lineup. The Inner Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-ec6bf2322e08]

Also known as: Tuna, UFO

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

11.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Champagne

Jewels

30j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1969

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