Seiko Cal. 5640 - 561

Released in 1982, the Cal. 5640 with design code 561 was part of Seiko's domestic market collection. With its 22mm lug width and 8.9mm profile, it sits comfortably on most wrists. [seikata-wm-aa70d3ac11bd]

Also known as: World Timer

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

34mm

Case Thickness

8.9mm

Lug Width

22mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Black

Jewels

34j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1982

Related Models

• Seiko 6146-276
• Seiko 4511-776
• Seiko 3838-686
• Seiko 0766-753
• Seiko 4496-878
• Seiko 4466-672
• Seiko 6189-340
• Seiko 6127-396
• Seiko 0717-834
• Seiko 5258-104
• Seiko 7166-926
• Seiko 4457-294