N406KA
This frame is the prototype King Air 250, with new Hartzell composite "scimitar" style propellers, that was displayed at NBAA Expo.
The prop tip is raked (a la) Scimitar, but not a true scimitar like the A.400M or An70.
Note, FAA USCAR lists frame as B200GT
http://www.hawkerbeechcraft.com/beechcraft/king_air_250/
Webpage show fictitious rego (N250KA) on this King Air 250
John