Possible pattern as the Mint frequently experimented with planchet variations in the 1950's.
Other thin planchet small cents are called patterns and sell for thousands of dollars each, such as Judd-299, Judd-356B, and Judd-405.
A fascinating anomaly regardless of what it is. Extremely rare on Wheat cents and vastly undervalued.
Sure to be the centerpiece of almost and Lincoln cent collection. Impress your friends and even your mother-in-law.