Seiko Cal. 6640 - 971

The Seiko 6640-971 represents an important milestone in Seiko's 1986 lineup. Powered by the 6640 caliber with 25j jewels beating at 36,000 bph, it delivers a 53 hours power reserve. [seikata-wm-e6e6a13ac089]

Also known as: Pogue

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

8.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Burgundy

Jewels

25j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1986

Related Models

• Seiko 6138-464
• Seiko 4515-163
• Seiko 7060-188
• Seiko 4569-648
• Seiko 6335-232
• Seiko 6351-991
• Seiko 4533-821
• Seiko 5654-998
• Seiko 7045-514
• Seiko 6311-391
• Seiko 6284-589
• Seiko 6187-568