While I was collecting Hartnetts and Prietos for part 1 I noticed the pipe looked like the exact same pipe in both men's paintings. I did some research and found they had studied with the same art teacher, Hartnett being a couple of years older. At some point Hartnett gifts his pipe to Prieto and the pipe above starts showing up in Prietos while another starts showing up in Hartnetts. I also found that nearly every museum in the world must have one or both of these artists. Extremely prolific at many variations of the same basic materials, the pipe being constant.