Seiko Cal. 5645 - 931

Seiko 5645-931

The 5645-931 is a sought-after Solar piece from Seiko's golden era. It features a Black dial protected by a Mineral crystal and offers 70m of water resistance. [seikata-wm-02977ab333c6]

Also known as: Sportsmatic, Emperor

Specifications

Movement
Solar
Case Material
Hardlex-Coated Steel
Case Width
37mm
Case Thickness
9.9mm
Lug Width
20mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
70m
Dial Color
Black
Jewels
18j
Frequency
28,800 bph
Power Reserve
39 hours
Year
1975

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