Seiko Cal. 6663 - 375

This Hand-Winding model from 1973 features a 37mm PVD Black case. It features a Green dial protected by a Acrylic crystal and offers 110m of water resistance. [seikata-wm-aab66bdc3fb5]

Also known as: Sumo, World Timer

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

37mm

Case Thickness

15.6mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Green

Jewels

28j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1973

Related Models

• Seiko 6339-895
• Seiko 6337-259
• Seiko 6272-588
• Seiko 0783-377
• Seiko 5281-345
• Seiko 5682-677
• Seiko 6248-832
• Seiko 6239-992
• Seiko 7142-755
• Seiko 3842-272
• Seiko 3857-860
• Seiko 3838-335