Seiko Cal. 6647 - 739

The 6647-739 is a sought-after Solar piece from Seiko's golden era. Powered by the 6647 caliber with 23j jewels beating at 36,000 bph, it delivers a 66 hours power reserve. [seikata-wm-60aa2ee6face]

Also known as: Monster, Bellmatic

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

12.5mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1979

Related Models

• Seiko 5631-349
• Seiko 7136-994
• Seiko 4432-743
• Seiko 7045-366
• Seiko 7092-991
• Seiko 0789-304
• Seiko 7049-729
• Seiko 6192-389
• Seiko 7069-335
• Seiko 4452-116
• Seiko 4496-993
• Seiko 6362-760