Amazon.com: Wall Clock 20. 1-48 of over 1,000 results for "wall clock 20" Results. Price and other details may vary based on product size and color. FirsTime & Co. Gray Arlo Wall Clock, Large Vintage Decor for Living Room, Home Office, Round, Plastic, Farmhouse, 20 inches. 1,985. 400+ bought in past month. $2666.