The Dunn Engineering Special was a racecar entered in the Indianapolis 500 during the second half of the 1950s, when the race was part of the FIA World Championship.
The cars were powered by the then-ubiquitous Offenhauser engine and were driven by Al Keller, Chuck Weyant and Al Herman. Their best result was thirteenth in 1959.
References
Dunn Engineering Wikipedia(Text) CC BY-SA