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Fantastic "DUO" slide projector produced during the mid-century golden era of United States manufacturing excellence.
The "DUO" refers to the fact that this is both a 35 mm ply slide projector and a 6 x 6/medium format slide projector. There are slide carriers for each format, and even a fancy new electric slide changer for standard 35 mm slides (which are actually 2 in.², and are often called "2 inch slides", especially in the earlier days.)
The projector sits in a very well-made wooden case which has built-in slide storage, and a reflective surface on one side, so you can watch or edit slides without setting up a slide projector screen, or taking pictures off the wall to create a screen!
All include a number of slide trays for storage and another projector lamp as a spare.