Italian antique signed 19th century watercolor genre painting the flower lady

Antique late 19th/early 20th century watercolor painting of a young woman selling her flowers on the street, 17 1/2" by 11 1/4" (20" by 14 1/4" framed), signed lower right by artist "S. Zanti" (or similar). The watercolor is in excellent condition considering the age, with fresh colors and no foxing. I do not see information on an artist by this name. There is an old Marshall, Field & Co. label on frame, indicating that the painting would have been offered at one time in Chicago by the big department store's then-active art department.