Seiko Cal. 6664 - 820

Released in 1979, the Cal. 6664 with design code 820 was part of Seiko's domestic market collection. Powered by the 6664 caliber with 28j jewels beating at 28,800 bph, it delivers a 58 hours power reserve. [seikata-wm-5bc769fcf85e]

Also known as: World Timer

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

15.3mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

160m

Dial Color

Champagne

Jewels

28j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1979

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