Seiko Cal. 6631 - 348

The 6631-348 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6631 caliber with 20j jewels beating at 21,600 bph, it delivers a 49 hours power reserve. [seikata-wm-fd1da7ea90e7]

Also known as: Helmet, UFO

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

40mm

Case Thickness

9.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

140m

Dial Color

Cream

Jewels

20j

Frequency

21,600 bph

Power Reserve

49 hours

Year

1970

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