Seiko Cal. 6641 - 684

This Spring Drive model from 1970 features a 39mm Stainless Steel case. The Inner Rotating bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-fe824facef4b]

Also known as: Silverwave, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

10.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

White

Jewels

25j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1970

Related Models

• Seiko 7116-967
• Seiko 6679-155
• Seiko 6228-143
• Seiko 6339-971
• Seiko 5681-314
• Seiko 0785-337
• Seiko 5260-628
• Seiko 4516-735
• Seiko 7022-193
• Seiko 7182-463
• Seiko 4434-480
• Seiko 5667-479