Seiko Cal. 6636 - 900

The Seiko 6636-900 represents an important milestone in Seiko's 1966 lineup. The Fixed bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-454c2ad2aba9]

Also known as: Tuna, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

13.4mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

40m

Dial Color

White

Jewels

20j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1966

Related Models

• Seiko 7180-169
• Seiko 6245-143
• Seiko 5684-102
• Seiko 5228-202
• Seiko 6220-596
• Seiko 6628-419
• Seiko 6364-983
• Seiko 5242-216
• Seiko 6178-229
• Seiko 7097-906
• Seiko 3877-129
• Seiko 3845-119