Niaux Cave

What a special double first day maxicard, with stamps issued 30 years apart, thank you PierreThe 1977 stamp on left shows priest-turned-'Father of Prehistory', Abbe Breuil. It was postmarked in his hometown with images he drew from Niaux, Font-de-Gaume and Lascaux
2010 marks the centenary for the Institute of Human Paleontology. Breuil and Prince Albert the 1st of Monaco are featured on a joint issue stamp. Prince Albert was a friend and financial backer to the excavations in the Grimaldi Cave systems of NW Italy illustrated in the background. Which cave is Breuil's postcard illustration from?
Thank you Axel! 1979 Niaux FDC. The cave art dates to the Magdalenian Period.