1-on-1: Comparing The A. Lange & Söhne 1815 Chronograph to The Datograph Up/Down
Patek Philippe was using Valjoux movements in their early chronographs before switching to Lemania While it was true that Patek Philippe made . Source
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Patek Philippe was using Valjoux movements in their early chronographs before switching to Lemania While it was true that Patek Philippe made . Source