Seiko Cal. 4421 - 551

This Spring Drive model from 1975 features a 46mm PVD Black case. The Rotating bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-08d35e164657]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

46mm

Case Thickness

13.5mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

40m

Dial Color

Navy

Jewels

18j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1975

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