Seiko Cal. 5639 - 917

Seiko 5639-917

The 5639-917 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5639 caliber with 24j jewels beating at 36,000 bph, it delivers a 39 hours power reserve. [seikata-wm-098ff21d52b4]

Also known as: Bullhead

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
42mm
Case Thickness
10.8mm
Lug Width
19mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
30m
Dial Color
White
Jewels
24j
Frequency
36,000 bph
Power Reserve
39 hours
Year
1968

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