Seiko Cal. 6631 - 906

Released in 1975, the Cal. 6631 with design code 906 was part of Seiko's domestic market collection. The Inner Rotating bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-95750ec5afb9]

Also known as: Goldfeather

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

12.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Burgundy

Jewels

17j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1975

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