Seiko Cal. 6640 - 534

The Seiko 6640-534 represents an important milestone in Seiko's 1988 lineup. It features a Blue Sunburst dial protected by a Sapphire crystal and offers 190m of water resistance. [seikata-wm-eb26c85bd42e]

Also known as: World Timer

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

14.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1988

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