Seiko Cal. 4420 - 787

The Seiko 4420-787 represents an important milestone in Seiko's 1990 lineup. Powered by the 4420 caliber with 21j jewels beating at 21,600 bph, it delivers a 46 hours power reserve. [seikata-wm-202d6a372474]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

34mm

Case Thickness

11.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Burgundy

Jewels

21j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1990

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