The insulator stands about 4 inches tall, 4 1/2 wide, and has no inner skirt. Also has the letter "W" underlined and in a circle on one ear and the number 8252 on the opposite ear. Any help identifying it or getting an approximate value would be wonderful! Thank you.
(Update) This is a U-418C fog bowl type. In brown they tend to go for $6 and some have been found in white. These generally fetch $10. Thanks again Dustin Logan and Steve Lohr!