Seiko Cal. 6657 - 997

The Seiko 6657-997 represents an important milestone in Seiko's 1980 lineup. Powered by the 6657 caliber with 23j jewels beating at 21,600 bph, it delivers a 59 hours power reserve. [seikata-wm-b54c7c01464b]

Also known as: Golden Tuna

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

38mm

Case Thickness

15.7mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1980

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