Seiko Cal. 4428 - 736

This Spring Drive model from 1968 features a 39mm PVD Black case. The Inner Rotating bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-e3e927dff221]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

39mm

Case Thickness

13.4mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1968

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