Seiko Cal. 4455 - 638

The Seiko 4455-638 represents an important milestone in Seiko's 1988 lineup. Powered by the 4455 caliber with 20j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-b0f87ff817e7]

Also known as: Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

13.9mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1988

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