This chronograph was part of a "infamous" auction sale that took place in Paris nearly 3 years ago. The sale ended with so few lots effectively sold that the official results were never published...
This chronograph was lot #39. The exact same photos used for the ebay sale were already used for the catalog, which can be downloaded here :
http://catalogue.gazette-drouot.com/pdf/124/90211/catacornette20180517bd.pdfClick to expand...