Seiko Cal. 6643 - 563

This Spring Drive model from 1991 features a 37mm Gold-Plated case. With its 20mm lug width and 15.3mm profile, it sits comfortably on most wrists. [seikata-wm-e1c8ee41a5be]

Also known as: Turtle, Sumo

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

15.3mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

30j

Frequency

36,000 bph

Power Reserve

69 hours

Year

1991

Related Models

• Seiko 6697-249
• Seiko 4471-597
• Seiko 6629-427
• Seiko 6336-628
• Seiko 0782-119
• Seiko 0760-990
• Seiko 6174-398
• Seiko 6664-519
• Seiko 5274-989
• Seiko 6310-736
• Seiko 5237-841
• Seiko 0718-996