Seiko Cal. 4540 - 632

This Spring Drive model from 1977 features a 45mm Hardlex-Coated Steel case. With its 18mm lug width and 11.4mm profile, it sits comfortably on most wrists. [seikata-wm-557cd0821b1a]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

11.4mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Navy

Jewels

34j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1977

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