Seiko Cal. 5687 - 306

Released in 1982, the Cal. 5687 with design code 306 was part of Seiko's domestic market collection. The Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-5a3eead5dd79]

Also known as: Tuna, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

15.9mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

160m

Dial Color

White

Jewels

26j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1982

Related Models

• Seiko 5273-367
• Seiko 3816-832
• Seiko 3888-996
• Seiko 6117-546
• Seiko 7064-807
• Seiko 4478-135
• Seiko 6312-177
• Seiko 4514-159
• Seiko 6143-872
• Seiko 0728-943
• Seiko 6316-423
• Seiko 6294-231