Seiko Cal. 4437 - 320

The 4437-320 is a sought-after Automatic piece from Seiko's golden era. Powered by the 4437 caliber with 25j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-58caf3235ac2]

Also known as: Emperor

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

42mm

Case Thickness

12.5mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Green

Jewels

25j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1973

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