The inscription "Invenit et Fecit" on the present watch refers to its movement, the famous Lépine calibre. It is furthermore fitted with a "virgule" escapement which Lépine claimed to be the inventor around 1750. It derived its name from the shape of the moving part of the balance staff, resembling a "comma" or "virgule" in French.
The case of the present watch is stamped PBT for Pierre Benjamin Tavernier. The renowned case maker located in Paris supplied his exceptional cases to the most famous watchmakers of the time, notably Breguet, Lépine, Ferdinand Berthoud and others.