Seiko Cal. 6631 - 648

The 6631-648 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6631 caliber with 34j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-0ec29b225b9f]

Also known as: Pogue, Helmet

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

40mm

Case Thickness

12.8mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Burgundy

Jewels

34j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1979

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