Seiko Cal. 4521 - 442

This Spring Drive model from 1971 features a 40mm Stainless Steel case. The Fixed bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-f7e962883d02]

Also known as: Monster, Crown

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

15.5mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

60m

Dial Color

Silver

Jewels

30j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1971

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