Seiko Cal. 5631 - 806

This Spring Drive model from 1999 features a 37mm Stainless Steel case. It features a Navy dial protected by a Sapphire crystal and offers 190m of water resistance. [seikata-wm-137f5e2a790c]

Also known as: Bullhead, UFO

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

9.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

190m

Dial Color

Navy

Jewels

21j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1999

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