Seiko Cal. 4521 - 639

The 4521-639 is a sought-after Spring Drive piece from Seiko's golden era. With its 22mm lug width and 12.4mm profile, it sits comfortably on most wrists. [seikata-wm-1365ee0aea7d]

Also known as: Sea Horse, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

12.4mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

90m

Dial Color

Black

Jewels

17j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1987

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