This aircraft is assumed to be c/n 520-3. Aero Design and Engineering started production in 1950 with N4100B (c/n 520-1). The relationship between rego and c/n was consistent for the first 10 aircraft. However, 520-3 is shown as N222E which it did not receive until 1956. The assumption is it was N4102B from 1950 to 1956. Photo from: Civil Aviation Historical Society, Melbourne, Australia