Seiko Cal. 5640 - 991

The Seiko 5640-991 represents an important milestone in Seiko's 1987 lineup. It features a Champagne dial protected by a Sapphire crystal and offers 130m of water resistance. [seikata-wm-bf23cbc262cd]

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

9.4mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Champagne

Jewels

21j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1987

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