Seiko Cal. 6664 - 137

The Seiko 6664-137 represents an important milestone in Seiko's 1991 lineup. Powered by the 6664 caliber with 36j jewels beating at 36,000 bph, it delivers a 47 hours power reserve. [seikata-wm-923a3fa08a85]

Also known as: Tuna, Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

9.5mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Silver

Jewels

36j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1991

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