Seiko Cal. 6639 - 933

Seiko 6639-933

The 6639-933 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 90m of water resistance. [seikata-wm-646c8e8641ef]

Also known as: Sumo, UFO

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
42mm
Case Thickness
15.5mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Fixed
Water Resistance
90m
Dial Color
Blue Sunburst
Jewels
31j
Frequency
36,000 bph
Power Reserve
70 hours
Year
1995

Related Models

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