Seiko Cal. 6631 - 777

The Seiko 6631-777 represents an important milestone in Seiko's 1977 lineup. The Bidirectional bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-f8e6ead837c2]

Also known as: Arnie

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

46mm

Case Thickness

14.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

50m

Dial Color

White

Jewels

21j

Frequency

21,600 bph

Power Reserve

67 hours

Year

1977

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