The lid is similar to another manhole cover made by the same manufacturer
The lid is also similar to a lid made by another manufacturer
In 2024 it was taken at 5 Rue de Pineau, 37190 Azay-le-Rideau, France, identical lid with opening instructions in French instead of English (CLOSE/OPEN → FERME/OUVERT) Click for a larger image
GS - Spheroidal graphite cast iron - a special cast iron in which the crystallization of carbon has been slowed down, which makes it close to steel - also called ductile iron (Thanks to Vuori Susi for the clarification)