Seiko Cal. 5640 - 842

Seiko 5640-842

The 5640-842 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5640 caliber with 25j jewels beating at 36,000 bph, it delivers a 46 hours power reserve. [seikata-wm-ba1b30130749]

Also known as: Sumo, Golden Tuna

Specifications

Movement
Automatic
Case Material
Titanium
Case Width
34mm
Case Thickness
14.2mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
120m
Dial Color
Blue Sunburst
Jewels
25j
Frequency
36,000 bph
Power Reserve
46 hours
Year
1981

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