Seiko Cal. 4440 - 304

The Seiko 4440-304 represents an important milestone in Seiko's 1987 lineup. Powered by the 4440 caliber with 21j jewels beating at 21,600 bph, it delivers a 70 hours power reserve. [seikata-wm-5fde8c449e89]

Also known as: UFO, Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

9.8mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Green

Jewels

21j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1987

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