Seiko Cal. 6657 - 392

The Seiko 6657-392 represents an important milestone in Seiko's 1991 lineup. Powered by the 6657 caliber with 26j jewels beating at 36,000 bph, it delivers a 61 hours power reserve. [seikata-wm-cf8891c69fa7]

Also known as: Tuna, UFO

Specifications

Movement

Solar

Case Material

Titanium

Case Width

43mm

Case Thickness

13.1mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

190m

Dial Color

Champagne

Jewels

26j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1991

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