Seiko Cal. 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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