Seiko Cal. 6631 - 623

The Seiko 6631-623 represents an important milestone in Seiko's 1974 lineup. It features a White dial protected by a Mineral crystal and offers 160m of water resistance. [seikata-wm-944fbd23e0f9]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

45mm

Case Thickness

14.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

160m

Dial Color

White

Jewels

22j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1974

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