It was dug out of a tomb, or sand dune, right?
IF the engine runs well, & IF the radio works well, & IF the servos all work, & IF the battery is OK, it could be worth ~ $200 Cdn, but looking at the condition, I'd say $100 - $125 max, & much less if any of the major bits are duds.
But that's Canada -- things is different in Oz