Seiko Cal. 6640 - 937

The Seiko 6640-937 represents an important milestone in Seiko's 1996 lineup. It features a Blue Sunburst dial protected by a Sapphire crystal and offers 140m of water resistance. [seikata-wm-e3a74f0b459c]

Also known as: Samurai, World Timer

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

37mm

Case Thickness

8.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

32j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1996

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