Seiko Cal. 6657 - 706

The Seiko 6657-706 represents an important milestone in Seiko's 1970 lineup. Powered by the 6657 caliber with 18j jewels beating at 28,800 bph, it delivers a 47 hours power reserve. [seikata-wm-a8e4fa1475e6]

Also known as: Navigator, Crown

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

38mm

Case Thickness

11.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Cream

Jewels

18j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1970

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