Seiko Cal. 6631 - 507

The Seiko 6631-507 represents an important milestone in Seiko's 1969 lineup. With its 20mm lug width and 14.7mm profile, it sits comfortably on most wrists. [seikata-wm-d33b6cd60012]

Also known as: Rally

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

14.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

50m

Dial Color

Navy

Jewels

19j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1969

Related Models

• Seiko 7138-953
• Seiko 3849-370
• Seiko 3826-247
• Seiko 6344-901
• Seiko 6354-176
• Seiko 6258-192
• Seiko 6128-926
• Seiko 4541-141
• Seiko 6341-271
• Seiko 6385-327
• Seiko 6280-922
• Seiko 6196-291