Seiko Cal. 4421 - 628

This Spring Drive model from 1970 features a 41mm PVD Black case. It features a Silver dial protected by a Sapphire crystal and offers 40m of water resistance. [seikata-wm-9045b7419b6d]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

41mm

Case Thickness

14.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Silver

Jewels

17j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1970

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