Seiko Cal. 5633 - 677

Seiko 5633-677

The Seiko 5633-677 represents an important milestone in Seiko's 1981 lineup. Powered by the 5633 caliber with 31j jewels beating at 36,000 bph, it delivers a 49 hours power reserve. [seikata-wm-189db431f9f6]

Also known as: UFO, Sportsmatic

Specifications

Movement
Automatic
Case Material
Gold-Plated
Case Width
43mm
Case Thickness
12.9mm
Lug Width
21mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
60m
Dial Color
Blue Sunburst
Jewels
31j
Frequency
36,000 bph
Power Reserve
49 hours
Year
1981

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