Seiko Cal. 4491 - 638

The Seiko 4491-638 represents an important milestone in Seiko's 1986 lineup. Powered by the 4491 caliber with 29j jewels beating at 21,600 bph, it delivers a 52 hours power reserve. [seikata-wm-eaa3957db94c]

Also known as: Rally, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

39mm

Case Thickness

8.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

60m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1986

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