Belphegor, or Phantom of the Louvre
Belphégor (original)
A mysterious phantom appears in the Musée du Louvre in Paris at night. The guards are unable to catch it. A student, André Bellegarde (Renier) obstinately tries to find out more about the strange creature by himself. He seems to be more effective in doing so than the local police led by commissaire Menardier (Dary). Bellegarde does cooperate with the police, too, but he mostly goes his own way investigating Belphégor's activity. A secret society is in the background. Bellegarde in the meantime is involved in two romances and cannot decide which woman to dedicate himself as the case gets more and more serious and criminal and threads meet.
Starring René Dary, Sylvie, Paul Crauchet, André Dumas, Muni, Nathalie Nerval, Jacques Dynam, Alain Mottet, Isaac Alvarez, Juliette Gréco
It's a mystery show, and has a rating of 7.5 out of 10 from Imdb which is usually fine for this kind of show.
Watch it here
Not found streaming from Ireland.