Has anybody got any information on a old"would say late 70's" metal detector? It's a Fortune finder 8000, old black box, toggle switch on handle(auto,man&reset),3 switch (on/off, batt check, disc& ground cancel), 5 knobs (vol, depth, tune, disc, ground cancel) and a white back ground intensity meter. It also has a 10inch coil with blue sticker same as Whites 5000/D but says Fortunefinder made by Linear Electronics Australia, any other info on this would be much appreciated.