During Viollet-le-Duc's restoration in the 19th century, a new clock was made. The 1867 Collin-Wagner movement, measuring two meters (6.5 feet) across, was located in the forest underneath the central spire within a glass-enclosed room. This controlled four dormer clock faces visible on the transept roofs, two on each side. This clock was destroyed in the 2019 fire. Shortly after the fire, French clockmaker Jean-Baptiste Vior discovered an almost identical 1867 Collin-Wagner movement in storage at Sainte-Trinité Church in northern Paris. Olivier Chandez, who had been responsible for the upkeep of Notre-Dame's clock, described the find as "almost a miracle." While the clock cannot simply be installed in Notre-Dame itself, it is hoped that the clock can be used to create a new clock for Notre-Dame to the same specifications as the one which was destroyed.