Seiko Cal. 5631 - 309

Seiko 5631-309

The 5631-309 is a sought-after Solar piece from Seiko's golden era. It features a Navy dial protected by a Mineral crystal and offers 190m of water resistance. [seikata-wm-75c21775a59a]

Also known as: Sumo, Sea Horse

Specifications

Movement
Solar
Case Material
Two-Tone
Case Width
45mm
Case Thickness
13.8mm
Lug Width
19mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
190m
Dial Color
Navy
Jewels
25j
Frequency
28,800 bph
Power Reserve
45 hours
Year
1967

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