Seiko Cal. 6631 - 425

The 6631-425 is a sought-after Solar piece from Seiko's golden era. Powered by the 6631 caliber with 29j jewels beating at 21,600 bph, it delivers a 52 hours power reserve. [seikata-wm-d4e7f15e5b36]

Also known as: Navigator, Flighty

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

34mm

Case Thickness

15.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Black

Jewels

29j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1971

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