Seiko Cal. 5640 - 987

The 5640-987 is a sought-after Hand-Winding piece from Seiko's golden era. The Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-6babcde5fff8]

Also known as: Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

8.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

30m

Dial Color

Burgundy

Jewels

25j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1998

Related Models

• Seiko 4583-681
• Seiko 5685-641
• Seiko 5224-229
• Seiko 5259-207
• Seiko 5294-666
• Seiko 5698-543
• Seiko 6285-324
• Seiko 6669-827
• Seiko 6647-186
• Seiko 7012-288
• Seiko 7156-513
• Seiko 3846-849