Seiko Cal. 5637 - 500

Seiko 5637-500

The 5637-500 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5637 caliber with 26j jewels beating at 21,600 bph, it delivers a 43 hours power reserve. [seikata-wm-97b482689a0f]

Also known as: Bullhead, UFO

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
42mm
Case Thickness
15.1mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
110m
Dial Color
Navy
Jewels
26j
Frequency
21,600 bph
Power Reserve
43 hours
Year
1994

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