Seiko Cal. 6631 - 620

The 6631-620 is a sought-after Solar piece from Seiko's golden era. Powered by the 6631 caliber with 20j jewels beating at 28,800 bph, it delivers a 62 hours power reserve. [seikata-wm-1f7f356a5442]

Also known as: Rally, Golden Tuna

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

41mm

Case Thickness

10.3mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Black

Jewels

20j

Frequency

28,800 bph

Power Reserve

62 hours

Year

1967

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