Seiko Cal. 4420 - 644

The Seiko 4420-644 represents an important milestone in Seiko's 1988 lineup. Powered by the 4420 caliber with 20j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-f85ef289ac57]

Also known as: Bellmatic

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

14.4mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1988

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