Seiko Cal. 6639 - 421

Seiko 6639-421

The Seiko 6639-421 represents an important milestone in Seiko's 1977 lineup. It features a Silver dial protected by a Mineral crystal and offers 60m of water resistance. [seikata-wm-1cd7ffc36622]

Also known as: Turtle, Navigator

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
41mm
Case Thickness
12.3mm
Lug Width
20mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
60m
Dial Color
Silver
Jewels
29j
Frequency
36,000 bph
Power Reserve
62 hours
Year
1977

Related Models

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