Seiko Cal. 6657 - 392

Seiko 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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