I acquired a North Dakota School of Mines piece of pottery a few years ago from my Mother-in-law. Shortly after that (knowing nothing about it) I saw an episode of Antiques Road Show about such pottery and thought it might be worth something. I stashed it for a few years and I am now revisiting it, I’m wondering it’s worth and how to go about selling it. I am attaching a picture of the vessel and its markings. I see you have appraised one for $3000 in 2014, wondering if mine is equally as valuable?