Seiko Cal. 6657 - 767

The Seiko 6657-767 represents an important milestone in Seiko's 1978 lineup. Powered by the 6657 caliber with 25j jewels beating at 28,800 bph, it delivers a 49 hours power reserve. [seikata-wm-1bda2efab1a2]

Also known as: Navigator, Arnie

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

13.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Navy

Jewels

25j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1978

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