Seiko Cal. 6645 - 864

The Seiko 6645-864 represents an important milestone in Seiko's 1979 lineup. Powered by the 6645 caliber with 36j jewels beating at 28,800 bph, it delivers a 63 hours power reserve. [seikata-wm-6d3c87ef4cdf]

Also known as: Helmet, Rally

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

14.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

170m

Dial Color

Silver

Jewels

36j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1979

Related Models

• Seiko 6617-768
• Seiko 4438-862
• Seiko 6317-138
• Seiko 3889-246
• Seiko 6647-353
• Seiko 3853-986
• Seiko 3819-138
• Seiko 7025-950
• Seiko 4494-889
• Seiko 5651-866
• Seiko 6157-590
• Seiko 7173-910