This old thermometer shows it is from Baker Brothers Mobil Products, Ava, Illinois. This is from the 1960's; before they used area codes on phone numbers. This thermometer originally showed the humidity, as well as the temperature. It was made in U.S.A. It measures 7" long x 2 1/4" wide. It is made of plastic with a cardboard type material on back. It is in very good condition, but I don't think it works anymore.. This is a great collectible for the collector of Mobil Oil and Gas Products. $10.00