Seiko Cal. 4521 - 228

The Seiko 4521-228 represents an important milestone in Seiko's 1971 lineup. With its 20mm lug width and 10.8mm profile, it sits comfortably on most wrists. [seikata-wm-178a8ad5ea14]

Also known as: Monster, Bullhead

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

10.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Navy

Jewels

25j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1971

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