Seiko Cal. 6636 - 631

The Seiko 6636-631 represents an important milestone in Seiko's 1971 lineup. It features a Green dial protected by a Mineral crystal and offers 160m of water resistance. [seikata-wm-35244aaeb365]

Also known as: Sportsmatic

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

36mm

Case Thickness

8.9mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Green

Jewels

20j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1971

Related Models

• Seiko 7161-671
• Seiko 6233-226
• Seiko 5695-288
• Seiko 6697-596
• Seiko 4577-896
• Seiko 5620-938
• Seiko 3821-675
• Seiko 6128-776
• Seiko 3815-574
• Seiko 6256-560
• Seiko 6615-982
• Seiko 5679-465