Seiko Cal. 6640 - 647

The Seiko 6640-647 represents an important milestone in Seiko's 1986 lineup. Powered by the 6640 caliber with 20j jewels beating at 28,800 bph, it delivers a 65 hours power reserve. [seikata-wm-616b09c4bc4d]

Also known as: Panda, Goldfeather

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

41mm

Case Thickness

11.2mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

90m

Dial Color

Silver

Jewels

20j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1986

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