Seiko Cal. 4437 - 221

The 4437-221 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4437 caliber with 28j jewels beating at 21,600 bph, it delivers a 61 hours power reserve. [seikata-wm-050d467271fd]

Also known as: Emperor

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

12.6mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

180m

Dial Color

Black

Jewels

28j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1996

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