Hi, I have come across a Model IV-1200 for sale ,at least that's what it is advertised as. What are the distinguishing features if any,that a person can identify the aircraft as a model IV-1200 or model IV-1050 ? I received info from the seller saying it was a Denney kit, so I want to make sure it is a 1200. Its aircraft ID plate has a gross of 1232 lbs and a serial number that doesn't correspond to any models in the history pages . I know the serial number on the fuselage tubing would help identify model weight and manufacturer (what are the locations again of the manufacturers serial number on the fuselage frame?), but if it is covered up , what else can a person use ? Vertical fin size? rudder size? anything else ? It has a 912s on it , if that makes any difference. Thanks all; Kevin