Seiko Cal. 6639 - 436

The 6639-436 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6639 caliber with 17j jewels beating at 21,600 bph, it delivers a 67 hours power reserve. [seikata-wm-166669044757]

Also known as: UFO

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

42mm

Case Thickness

11.5mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Green

Jewels

17j

Frequency

21,600 bph

Power Reserve

67 hours

Year

1986

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