Seiko Cal. 5691 - 647

The 5691-647 is a sought-after Quartz piece from Seiko's golden era. Powered by the 5691 caliber with 25j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-a3e2ffe9bfd4]

Also known as: Helmet

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

46mm

Case Thickness

15.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Burgundy

Jewels

25j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1967

Related Models

• Seiko 7182-438
• Seiko 3896-230
• Seiko 0750-328
• Seiko 0789-238
• Seiko 0772-879
• Seiko 4480-864
• Seiko 6172-928
• Seiko 7073-837
• Seiko 7173-949
• Seiko 5299-509
• Seiko 5669-544
• Seiko 7080-122