Seiko Cal. 6636 - 781

The Seiko 6636-781 represents an important milestone in Seiko's 1982 lineup. With its 19mm lug width and 11.1mm profile, it sits comfortably on most wrists. [seikata-wm-683a3062b911]

Also known as: Sumo, Flighty

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

36mm

Case Thickness

11.1mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Green

Jewels

21j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1982

Related Models

• Seiko 5619-626
• Seiko 4544-311
• Seiko 0727-920
• Seiko 6195-605
• Seiko 3867-727
• Seiko 5682-605
• Seiko 3838-420
• Seiko 4421-114
• Seiko 6389-124
• Seiko 5655-326
• Seiko 0722-704
• Seiko 4574-446