Seiko Cal. 4437 - 528

Released in 1971, the Cal. 4437 with design code 528 was part of Seiko's domestic market collection. With its 21mm lug width and 15.1mm profile, it sits comfortably on most wrists. [seikata-wm-b0fe360be941]

Also known as: Monster, Bullhead

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

15.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Black

Jewels

21j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1971

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