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A while ago, I posted about the Girard-Perregaux Richeville chronograph with caliber 8381. This movement is not inhouse as I wrote, but it is based on the Lemania 1872. David Alstott emailed me this correction and included a nice scan of a Lemania 1872 trio.

You can read more about Girard-Perregaux at WatchRap (by ThePurists), they have a special section for Girard-Perregaux.