Seiko Cal. 5687 - 640

The 5687-640 is a sought-after Quartz piece from Seiko's golden era. It features a Silver dial protected by a Sapphire crystal and offers 70m of water resistance. [seikata-wm-cd5cbd01f2d1]

Also known as: Sumo, Shogun

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

8.1mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

70m

Dial Color

Silver

Jewels

25j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1972

Related Models

• Seiko 4564-640
• Seiko 6267-446
• Seiko 7085-159
• Seiko 6122-728
• Seiko 4515-547
• Seiko 4533-510
• Seiko 3848-566
• Seiko 4423-322
• Seiko 4551-151
• Seiko 6127-377
• Seiko 7083-431
• Seiko 5688-444