Seiko Cal. 6631 - 535

The 6631-535 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6631 caliber with 25j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-160874e3b9e1]

Also known as: Rally, Crown

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

42mm

Case Thickness

8.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

170m

Dial Color

Cream

Jewels

25j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1968

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