http://www.ebay.com/itm/1947-BALL-604-IGNITION-GAS-POWERED-TETHER-CAR-MODEL-AIRPLANE-ENGINE-/131722035155?hash=item1eab3ebfd3:g:2kQAAOSwKtVWtsYGHey Sparky, this Ball is now on Ebay, SN 167; is it your dad's?