On ebay right now. If you collect the early discriminators this is a definite must for your collection. I believe that it came out in 1974 or 1975. This used off-resonance technology. I can't explain this technology but Carl can! This detector could discriminate out the pulltabs, bottlecaps, tin-foil, etc in the era when all the other detectors had no discrimination or used limited discrimination. The early Garrett discriminators would not cut out pull-tabs for instance! This detector had excellent see-thru ability. For example, it would see a silver dime beneath iron nails or tin-foil! Also many users of this detector claimed fo find gold rings in full pull-tab discrimination because of this off-resonance technology! Not sure if these claims are true but I know that these machines are a lot of fun to use. Take one to a worked-out area and set it on low discrimination and one would be amazed at all the signals that are produced! Note: this particular machine on ebay may have problems, the current seller doesn't even know on how to get to the batteries! GOOD LUCK! JOE
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