We brought this over from England after purchasing as an antique in the 1970s. It is likely Edwardian or Victorian.
Includes tile backsplash which is currently not attached, so you can use without. Tile backsplash piece is 1 inch deep and about 21.5 inches long on each side. 
Diagonal dimension is 31 inches, and back to front is 21.5. 
28 inches from floor to marble top; 44 inches from floor to top of tile backsplash.