Seiko Cal. 4428 - 604

The Seiko 4428-604 represents an important milestone in Seiko's 1968 lineup. The Coin-Edge bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-2acd9806b21d]

Also known as: Sumo, Flighty

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

36mm

Case Thickness

11.0mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Burgundy

Jewels

25j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1968

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