Not often see, but a very clever item.
Here is the original dealer advertisement:
Quadraplex is a display stand and tray handcrafted from the finest exotic hardwoods, which displays 4 items freely selected by members of the audience. These items remain in full view at all times. The magician, without handling the selected items, then mentally divines them, much to the audiences amazement. By using dollar bills, playing cards, product names, tarot cards, company names, etc., Quadraplex can be used in close-up, stage work, reviews conventions, kid shows, and is a must for trade shows and promotions. As an added incentive, we have included a first-rate, original routine.
Quadraplex is easily handled by all and uses no complicated formulas, no stooges, no one-ahead principles, no signaling, and no slight-of-hand. We guarantee that the items selected are of a totally free choice.
This is a used item and shows some signs of wear, I would suggest rubbing some oils into the frame to restore it to its former luster. Complete as released by the manufacturer, you will need to make up some paper strips with names and numbers for the presentation as outlined in the instructions.