Seiko Cal. 6645 - 690

The Seiko 6645-690 represents an important milestone in Seiko's 1970 lineup. Powered by the 6645 caliber with 31j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-cbf4e4c5a657]

Also known as: Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

15.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

60m

Dial Color

White

Jewels

31j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1970

Related Models

• Seiko 7174-544
• Seiko 6254-276
• Seiko 5263-514
• Seiko 6335-734
• Seiko 4496-690
• Seiko 5224-825
• Seiko 4590-189
• Seiko 6640-826
• Seiko 6627-373
• Seiko 6613-394
• Seiko 5213-744
• Seiko 0796-213