Introducing the High-frequency Longines Ultra-Chron
Replacing the groundbreaking caliber 431 is the current high-frequency, self-winding caliber L836.6, with a silicon hairspring that is resistant to...
Read moreReplacing the groundbreaking caliber 431 is the current high-frequency, self-winding caliber L836.6, with a silicon hairspring that is resistant to...
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