Seiko Cal. 4437 - 330

This Hand-Winding model from 1968 features a 36mm Hardlex-Coated Steel case. Powered by the 4437 caliber with 19j jewels beating at 21,600 bph, it delivers a 60 hours power reserve. [seikata-wm-acb1ec3fcbaa]

Also known as: Sumo, UFO

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

11.3mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Black

Jewels

19j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1968

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