Seiko Cal. 6634 - 520

The Seiko 6634-520 represents an important milestone in Seiko's 1977 lineup. It features a Black dial protected by a Hardlex crystal and offers 30m of water resistance. [seikata-wm-d826152a8e02]

Also known as: Bullhead, Crown

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

11.3mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Black

Jewels

32j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1977

Related Models

• Seiko 6254-711
• Seiko 6272-531
• Seiko 3854-684
• Seiko 6362-922
• Seiko 4576-327
• Seiko 6214-858
• Seiko 6193-713
• Seiko 6152-643
• Seiko 6112-836
• Seiko 3839-970
• Seiko 7078-761
• Seiko 5653-662