Seiko Cal. 6631 - 333

The Seiko 6631-333 represents an important milestone in Seiko's 1981 lineup. It features a Burgundy dial protected by a Mineral crystal and offers 30m of water resistance. [seikata-wm-18841a03b339]

Also known as: Helmet

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

44mm

Case Thickness

11.4mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Burgundy

Jewels

22j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1981

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