Mk I
Automatic Seiko NH35
Sapphire crystal with anti-reflective coating
Screw-down crown
39mm (excluding crown)
100m Water resistance
Swiss C3 super luminous
Mk II
Automatic Seiko NH35
Sapphire crystal
Screw-down crown
39mm (excluding crown)
100m Water resistance
Mk III
Automatic Seiko NH38
Sapphire crystal
Screw-down crown
39mm (excluding crown)
100m Water resistance
Mk IV
Automatic Seiko NH38
Sapphire crystal
Screw-down crown
39mm (excluding crown)
100m Water resistance
Mk V
Automatic Seiko NH38
Sapphire crystal
Screw-down crown
39mm (excluding crown)
100m Water resistance
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