Seiko Cal. 4521 - 418

This Hand-Winding model from 1980 features a 36mm Gold-Plated case. With its 22mm lug width and 12.0mm profile, it sits comfortably on most wrists. [seikata-wm-84ef078bfb20]

Also known as: Tuna, Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

12.0mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1980

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