Seiko Cal. 6631 - 558

The 6631-558 is a sought-after Automatic piece from Seiko's golden era. It features a Navy dial protected by a Mineral crystal and offers 70m of water resistance. [seikata-wm-3dbd89014599]

Also known as: UFO, Golden Tuna

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

10.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

70m

Dial Color

Navy

Jewels

28j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1997

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