The Rosso's will buy glass from manufacturers as a wholesaler to resell to retailers. Some of this glass, bought and sold, was iridized. Certain pieces, that the Rosso's may have commissioned the manufacturers to make specifically for them, were marked Rosso with an "R" or a capital R in a keystone.
To the right is a small iridized novelty called "Belle". Just above is the mark on the bottom of this piece.
