Seiko Cal. 6657 - 291

Seiko 6657-291

The 6657-291 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6657 caliber with 36j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-3c67b1b051c2]

Also known as: UFO, Sea Horse

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
36mm
Case Thickness
10.5mm
Lug Width
20mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
60m
Dial Color
Champagne
Jewels
36j
Frequency
21,600 bph
Power Reserve
69 hours
Year
1992

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