Note that the symbol that forms the background of the lid is the logo of the manufacturer
The meaning of the inscription LA CHISERIA (the church) is not clear
GJS-500-7 also called GGG50 marks a strong and heat-resistant type of metal while GJS is a sign for Continuously Cast Spheroidal Graphite Iron - which describes a process in which the metal is continuously fed.
The lid is similar to other manhole covers made by the same manufacturer, for example Click for cover's details