Seiko Cal. 6635 - 671

The 6635-671 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6635 caliber with 35j jewels beating at 28,800 bph, it delivers a 52 hours power reserve. [seikata-wm-2a7af372e608]

Also known as: Helmet, UFO

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

42mm

Case Thickness

11.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Cream

Jewels

35j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1977

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