Seiko Cal. 4491 - 638

Seiko 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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