Seiko Cal. 5613 - 639

Seiko 5613-639

The Seiko 5613-639 represents an important milestone in Seiko's 1971 lineup. It features a Blue Sunburst dial protected by a Mineral crystal and offers 50m of water resistance. [seikata-wm-416978bc81dd]

Also known as: UFO, Sportsmatic

Specifications

Movement
Solar
Case Material
Gold-Plated
Case Width
34mm
Case Thickness
14.3mm
Lug Width
18mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
50m
Dial Color
Blue Sunburst
Jewels
36j
Frequency
21,600 bph
Power Reserve
52 hours
Year
1971

Related Models

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