Measures 7" X 4 1/2", overall. The 1,200 horsepower R-1830 86 was installed on numerous WWII aircraft including the Consolidated B-24 Liberator, Consolidated PBY Catalina, Douglas DC-3/C-47 and Grumman F4F Wildcat. Absolutely original artifact riveted to formed aircraft aluminum. Designed so that it may be attractively mounted to a flat surface, allowing a comfortable viewing angle. A wonderful, one-off display for the vintage-aviation enthusiast. Made in the USA.