Seiko Cal. 4437 - 604

The 4437-604 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4437 caliber with 20j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-c736ac0e2c5e]

Also known as: Navigator

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

35mm

Case Thickness

11.2mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

160m

Dial Color

Black

Jewels

20j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1994

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