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Longines Ultra Chron Ref.8317-2 Cal.431 Overhaul Vintage Automatic Mens Watch - Japan Pre-owned Vintage
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LONGINES Ultra-Chron. High-Frequency 5 Hz = 36.000 A/h. “Ultra Chronometer Officially Certified” - YouTube
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Longines Ultra-Chron Chronometer Automatic Date 28800 Hi-Beat... for $641 for sale from a Seller on Chrono24
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