Decorative monument or sepulcher plaque, probably funerary stele, in white marble, representing an hourglass, vintage 18th century.
This plate is in good general condition. The iconography of the hourglass in funerary symbolism represents time which inexorably passes but also resurrection through the fact that it can be turned over to start a new life.
Please note: some small accidents and chips, dirt and wear over time, see photos.