Seiko Cal. 6689 - 240

The Seiko 6689-240 represents an important milestone in Seiko's 1971 lineup. The Inner Rotating bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-90e886edbedc]

Also known as: Tuna, UFO

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

10.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

32j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1971

Related Models

• Seiko 4474-727
• Seiko 6685-720
• Seiko 3857-862
• Seiko 5682-931
• Seiko 6276-324
• Seiko 7052-833
• Seiko 4578-706
• Seiko 7031-252
• Seiko 6150-767
• Seiko 0712-664
• Seiko 3848-852
• Seiko 6180-697