The backstamp "CFH GDM" found on this piece of antique porcelain indicates the item was produced in Limoges, France, and provides information about its origin and makers:
CFH: stands for Charles Field Haviland, a prominent name in Limoges porcelain production
GDM: stands for Gerard, Dufraisseix, and Morel, a company that was taken over by Haviland
This specific "CFH GDM" mark was used by Gerard. Dufraisseix, and Morel between approximately 1882 and 1890.
These items are often highly sought after by collectors due to their historical significance and craftsmanship.