Green onyx wall font

Magnificent old holy water font 1870-1920, green onyx plaque on a gilded brass background, on the front a large silver metal relief medallion (nature unknown but perhaps silver plated copper) depicting the virgin in profile and halo, shape of window, surrounded by lilies, below inscription "sancta maria" letters and stems of lilies as well as the bottom of the gilded metal frame. Small stoup in the shape of a silver flower bell with golden petal rim and tail, original. 21cm high by 10.5cm wide, approximately 4cm deep with the font. Very good general condition, no chips or cracks in the stone, the metal is relatively clean and shiny but has some small traces of black oxidation on the edges of the flowers in particular, the font itself is a little darker and the interior is a little oxidized but it remains discreet. The brass plate is in good condition but has some stains, it is on the back so not annoying. Finally, a few small marks from time, relatively inconspicuous superficial scratches on the metal and stone. Medallion signed "s.kinsburger" "hf" or "af" sylvain kinsburger. Very pretty, unusual piece, the onyx is of very good quality, translucent and very green, the contrast between the stone and the metal is very pleasant to the eye. About 1.2kg.