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Breguet: classique 5177 or 5197
I have been contemplating on obtaining a 3-hander from the classique collection and have been drawn to the 5177(caliber 777Q) and 5197(caliber 591A) in white gold. My understanding is that caliber 591A has the balance spring made of silicon as opposed to the regular Breguet overcoil. Is this an actu
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