Mario collected many things, and in quantity. He had an extraordinary collection of 10 pound Peanut Tins, likely an example of all or almost all that were made. He made a drawing illustrating all the ones he had and sent it to friends, asking that they call him if they saw one that wasn’t on the drawing. There is a collection of things-made-of-other-things, of men with flies their nose, of taxidermy glass eyes, of chalk kewpie dolls, of sock monkeys, and more. The Pueblo Museum of Art mounted a show of Collections of 100 or More Things; most of the exhibits were Mario’s collections.
A major collection, formed over many decades, is Mario’s collection of Bakelite jewelry. He developed great expertise in this field, and bought and sold Bakelite at a level that made him one of the premier collector/dealers in the country.