Seiko Cal. 6631 - 879

The Seiko 6631-879 represents an important milestone in Seiko's 1977 lineup. It features a Silver dial protected by a Mineral crystal and offers 150m of water resistance. [seikata-wm-d30235e853d6]

Also known as: Rally, Baby Tuna

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

40mm

Case Thickness

15.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

150m

Dial Color

Silver

Jewels

20j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1977

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