Seiko Cal. 4540 - 521

Seiko 4540-521

This Spring Drive model from 1976 features a 38mm Gold-Plated case. With its 21mm lug width and 10.8mm profile, it sits comfortably on most wrists. [seikata-wm-fc57b784c0cc]

Also known as: Tuna, Helmet

Specifications

Movement
Spring Drive
Case Material
Gold-Plated
Case Width
38mm
Case Thickness
10.8mm
Lug Width
21mm
Crystal
Acrylic
Bezel
Bidirectional
Water Resistance
90m
Dial Color
Blue Sunburst
Jewels
20j
Frequency
21,600 bph
Power Reserve
69 hours
Year
1976

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