The sole surviving Kari Keen "Sioux Coupe" 90B, N10721, has recently been restored by Forrest Lovely and was voted this year's Oshkosh Antique Grand Champion. It is powered by a 90 h.p. Warner and has a maximum speed of 115 m.p.h.

Kari Keen Coupe 90B NC10721, c/n. 401, made by Sioux Aircraft Corp. in around 1930, is the only survivor of a small batch built. It won the Grand Champion Antique award