Seiko Cal. 4421 - 237

The Seiko 4421-237 represents an important milestone in Seiko's 1991 lineup. Powered by the 4421 caliber with 36j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-51de0cd4b4c2]

Also known as: Shogun, Tuna

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

43mm

Case Thickness

14.0mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

36j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1991

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