Seiko Cal. 6631 - 642

The 6631-642 is a sought-after Automatic piece from Seiko's golden era. It features a Burgundy dial protected by a Acrylic crystal and offers 70m of water resistance. [seikata-wm-22b990587b46]

Also known as: Sea Horse, Baby Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

41mm

Case Thickness

12.5mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

70m

Dial Color

Burgundy

Jewels

23j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1987

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