Hammerton ?Invisible Assistant? Holdout. London: George Hammerton (for Harry Stanley), 1957. Finely crafted mechanical metal holdout, sometimes called ?Cardini?s Third Hand.? Sold as an aid to manipulators, or as a device used to cheat at cards. This item is being offered by Bob Swadling from his personal collection. All proceeds from the sale of this lot, including buyer?s premiums, will be directed to a fund set up in benefit of Sebastian Midtvaage for the costs of his cancer treatment and healthcare.