Seiko Cal. 6631 - 109

The 6631-109 is a sought-after Automatic piece from Seiko's golden era. It features a Navy dial protected by a Hardlex crystal and offers 40m of water resistance. [seikata-wm-1c69b9cd4a18]

Also known as: Golden Tuna, Arnie

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

42mm

Case Thickness

11.4mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Navy

Jewels

27j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1976

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