The older ones with the box intact are worth about $50 or so according to the ones I seen go on Ebay.

As for flying ability of a plastic plane those Cox PT 19 were among the better fliers. I have had a few of them and we could get the best flights since the wing area was the biggest. We are not talking about loops and inverted flights here. Your basic go around circles until the fuel runs out is about all you can expect to achieve with these planes.

Take it out and fly it unless you are not a control line guy. Sell it to the highest bidder on the Bay .

Hope this helps.

Jay