Seiko Cal. 6631 - 181

The Seiko 6631-181 represents an important milestone in Seiko's 1991 lineup. It features a Navy dial protected by a Acrylic crystal and offers 150m of water resistance. [seikata-wm-1dbfe288e16e]

Also known as: UFO

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

15.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Navy

Jewels

30j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1991

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