Seiko Cal. 6643 - 311

The Seiko 6643-311 represents an important milestone in Seiko's 1965 lineup. The Inner Rotating bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-d218bdc7ed84]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

38mm

Case Thickness

13.3mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Burgundy

Jewels

27j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1965

Related Models

• Seiko 5695-621
• Seiko 4413-914
• Seiko 6294-265
• Seiko 4461-755
• Seiko 5640-310
• Seiko 7084-140
• Seiko 5245-660
• Seiko 7073-718
• Seiko 6297-571
• Seiko 5287-522
• Seiko 0769-175
• Seiko 7113-146