Seiko Cal. 0731 - 690

The Seiko 0731-690 represents an important milestone in Seiko's 1985 lineup. The Coin-Edge bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-a24bdc03b95d]

Also known as: Tuna, Silverwave

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

15.3mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Green

Jewels

26j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1985

Related Models

• Seiko 6184-687
• Seiko 4415-350
• Seiko 7168-772
• Seiko 5292-622
• Seiko 5218-465
• Seiko 4429-641
• Seiko 3851-541
• Seiko 6327-644
• Seiko 4494-594
• Seiko 5218-314
• Seiko 0749-544
• Seiko 4443-232