Seiko Cal. 4440 - 640

The Seiko 4440-640 represents an important milestone in Seiko's 1985 lineup. Powered by the 4440 caliber with 19j jewels beating at 21,600 bph, it delivers a 63 hours power reserve. [seikata-wm-b14e2c51b16d]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

9.2mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

160m

Dial Color

White

Jewels

19j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1985

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