Seiko Cal. 6647 - 320

The Seiko 6647-320 represents an important milestone in Seiko's 1977 lineup. Powered by the 6647 caliber with 23j jewels beating at 28,800 bph, it delivers a 66 hours power reserve. [seikata-wm-1dde746cb1cd]

Also known as: Sportsmatic, Flighty

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

42mm

Case Thickness

9.6mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Silver

Jewels

23j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1977

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