This caliber JLC 899 was found in a Jaeger-LeCoultre Master Control Date in 18K gold (reference 176.2.40.S aka Q1542520). Each caliber 899 is said to be tested rigorously for 1,000 before leaving the factory.
Ultra Flat
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Who in the US can service this movement?
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Seems that 0950 is the new version Maybe same situation with 9011 and 9051