Seiko Cal. 4490 - 633

The Seiko 4490-633 represents an important milestone in Seiko's 1978 lineup. Powered by the 4490 caliber with 36j jewels beating at 28,800 bph, it delivers a 42 hours power reserve. [seikata-wm-bdfb451dfaa5]

Also known as: Helmet

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

8.5mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

180m

Dial Color

Green

Jewels

36j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1978

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