Bob, having the box, wrenches and instructions obviously raises the value. Later versions of the engine still carry pretty good merit. Newer versions with the plastic back plate aren't as desired. You have EBAY which several suffer from Igottahaveit disease which generally runs the prices up beyond what most would pay for it. Prices have gone close to $100 whereas some of the other forums generally have a asking price closer to $60 for what your offering. At the same time I have seen these sell closer to $45 and up. If you look at completed listings on EBAY you will understand how there's absolutely no direction as to the why of prices. New in the box examples have been sold under $40 and as high as $140.

             Dan Banjock, myself and a few others have been playing around with school yard type freeflight stuff. Locating the Pee Wee seems to be more difficult these days. The other is that there's little to no parts support. Glow plugs and gasket rebuild parts are available. No other parts are currently available. Having participated in many of our swap meets, it's clearly obvious if your in search of the highest dollar value of this engine, EBAY is your best option even with the fees encountered.  Ken