Seiko Cal. 4521 - 528

This Spring Drive model from 1971 features a 36mm Titanium case. With its 19mm lug width and 12.3mm profile, it sits comfortably on most wrists. [seikata-wm-c5c193883626]

Also known as: Monster, Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

36mm

Case Thickness

12.3mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

190m

Dial Color

Cream

Jewels

20j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1971

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