I've heard a couple of threads about best deals you have ever had, and the best buy you ever made, but how about the worst sell? What coin(s) or when was there a time that you sold something and regret it? For me one major thing stands out. I regret to the bone that I sold all of my mercury dimes. I ended up selling 500 for 1k and another 250 for 550. Just a complete waste. These Mercury Dimes were VF-XF and I basically sold them below melt. This was a few months ago when I really had no idea what I was doing with coins.