Seiko Cal. 4591 - 636

Seiko 4591-636

The 4591-636 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4591 caliber with 17j jewels beating at 28,800 bph, it delivers a 52 hours power reserve. [seikata-wm-20886a215904]

Also known as: Monster, UFO

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
37mm
Case Thickness
11.4mm
Lug Width
21mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
150m
Dial Color
Champagne
Jewels
17j
Frequency
28,800 bph
Power Reserve
52 hours
Year
1991

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seikata-wm-20886a215904