Seiko Cal. 6635 - 811

The Seiko 6635-811 represents an important milestone in Seiko's 1981 lineup. It features a Navy dial protected by a Sapphire crystal and offers 200m of water resistance. [seikata-wm-1374722fbd9d]

Also known as: Bullhead, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

40mm

Case Thickness

14.5mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

200m

Dial Color

Navy

Jewels

28j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1981

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