Seiko Cal. 5631 - 399

Seiko 5631-399

The Seiko 5631-399 represents an important milestone in Seiko's 1988 lineup. It features a Green dial protected by a Hardlex crystal and offers 150m of water resistance. [seikata-wm-4a80eb964666]

Also known as: Turtle, UFO

Specifications

Movement
Hand-Winding
Case Material
Gold-Plated
Case Width
36mm
Case Thickness
9.3mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Inner Rotating
Water Resistance
150m
Dial Color
Green
Jewels
20j
Frequency
28,800 bph
Power Reserve
62 hours
Year
1988

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