Seiko Cal. 6658 - 957

The Seiko 6658-957 represents an important milestone in Seiko's 1973 lineup. Powered by the 6658 caliber with 34j jewels beating at 28,800 bph, it delivers a 52 hours power reserve. [seikata-wm-d79cc26b039f]

Also known as: Bellmatic, World Timer

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

10.5mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1973

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