I've attempted to accurately capture the light fixture with the photos and have listed the dimensions below. If you have additional questions feel free to ask. You won't find one online complete and original like this for the price I'm asking.
Dimensions: Metal exterior base circumference: 5 1/4 inches Glass circumference: 3 1/2 inches Depth: approximately 3 3/4 inches. The item "Vintage Antique Round Art Deco Glass Exit Light Sign with Original Base ca 1940's" is in sale since Saturday, June 2, 2018. This item is in the category "Collectibles\Lamps, Lighting\Other Collectible Lighting".
The seller is "houseboystyle" and is located in Chicago, Illinois. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Bahamas.