Vintage Handmade Algerian Leather Slipper Shoes Size 9

Vintage slippers made in Algeria around the 1980s. Unisex shoes. Fits like a size 9 in womans. Has obvious mold/mildew on the front and sides of the shoe. I am sure there is a way to clean leather properly, but unfortunately, I do not know how! I included a picture of what the slipper looks like on my foot. Meant to be worn as a house shoe.