Seiko Cal. 6635 - 440

The Seiko 6635-440 represents an important milestone in Seiko's 1980 lineup. It features a Black dial protected by a Mineral crystal and offers 150m of water resistance. [seikata-wm-5a4dc1d38738]

Also known as: Bullhead, Navigator

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

8.4mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Black

Jewels

32j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1980

Related Models

• Seiko 6663-518
• Seiko 6184-405
• Seiko 6390-891
• Seiko 7125-252
• Seiko 7171-350
• Seiko 3820-835
• Seiko 6199-749
• Seiko 7123-724
• Seiko 4478-608
• Seiko 5212-194
• Seiko 7072-765
• Seiko 6267-809