Seiko Cal. 6631 - 500

The Seiko 6631-500 represents an important milestone in Seiko's 1981 lineup. It features a Navy dial protected by a Mineral crystal and offers 160m of water resistance. [seikata-wm-71939a21acbb]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

45mm

Case Thickness

10.0mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Navy

Jewels

35j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1981

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