Seiko Cal. 6640 - 794

The Seiko 6640-794 represents an important milestone in Seiko's 1977 lineup. It features a Navy dial protected by a Acrylic crystal and offers 30m of water resistance. [seikata-wm-4a820e6f6401]

Also known as: Samurai, Monster

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

37mm

Case Thickness

15.8mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

30m

Dial Color

Navy

Jewels

34j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1977

Related Models

• Seiko 6226-600
• Seiko 6284-886
• Seiko 3883-750
• Seiko 6330-540
• Seiko 0725-550
• Seiko 7127-243
• Seiko 6693-451
• Seiko 6686-399
• Seiko 5621-552
• Seiko 5627-614
• Seiko 4494-383
• Seiko 5280-982