Seiko Cal. 4590 - 637

Seiko 4590-637

The 4590-637 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4590 caliber with 26j jewels beating at 21,600 bph, it delivers a 70 hours power reserve. [seikata-wm-aa29640df13b]

Also known as: Baby Tuna

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
42mm
Case Thickness
10.1mm
Lug Width
18mm
Crystal
Sapphire
Bezel
Coin-Edge
Water Resistance
160m
Dial Color
White
Jewels
26j
Frequency
21,600 bph
Power Reserve
70 hours
Year
1983

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