Seiko Cal. 6391 - 728

The Seiko 6391-728 represents an important milestone in Seiko's 1970 lineup. The Inner Rotating bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-80445674910e]

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

35mm

Case Thickness

10.0mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Green

Jewels

24j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1970

Related Models

• Seiko 4498-928
• Seiko 7093-331
• Seiko 5282-307
• Seiko 6651-778
• Seiko 6611-814
• Seiko 7194-627
• Seiko 7061-797
• Seiko 5658-591
• Seiko 0715-130
• Seiko 3895-986
• Seiko 6311-421
• Seiko 6655-669