Seiko Cal. 5637 - 366

Seiko 5637-366

The 5637-366 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5637 caliber with 34j jewels beating at 28,800 bph, it delivers a 45 hours power reserve. [seikata-wm-1ef1c16fde39]

Also known as: Sumo, Pogue

Specifications

Movement
Automatic
Case Material
Titanium
Case Width
42mm
Case Thickness
15.4mm
Lug Width
21mm
Crystal
Acrylic
Bezel
Coin-Edge
Water Resistance
140m
Dial Color
Burgundy
Jewels
34j
Frequency
28,800 bph
Power Reserve
45 hours
Year
1980

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