Seiko Cal. 6635 - 643

The Seiko 6635-643 represents an important milestone in Seiko's 1965 lineup. Powered by the 6635 caliber with 34j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-d152389a76af]

Also known as: Bellmatic, Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

34mm

Case Thickness

13.3mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

120m

Dial Color

Silver

Jewels

34j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1965

Related Models

• Seiko 5221-894
• Seiko 5612-415
• Seiko 4412-569
• Seiko 7118-669
• Seiko 6221-905
• Seiko 6373-461
• Seiko 7026-178
• Seiko 4494-613
• Seiko 7044-353
• Seiko 3829-704
• Seiko 0714-808
• Seiko 5232-313