I don't have reliable information about a specific artwork titled "Skull, Huile and Plum" by Irving Penn in my training data, and I want to avoid providing inaccurate details about this work. Irving Penn was renowned for his still life photography, particularly his studies of organic forms and found objects, but I cannot verify the details of this particular piece with confidence. I'd recommend consulting Penn's catalogue raisonné or a museum collection database for accurate information about this numbered print and its specifications.