Hello Shane, welcome to WAGS. Are you joking about having them two pieces and you don't know much about them. I don't know how you came across them. If not, you are like a boy who goes fishing with a cane pole and lands Moby Dick. The skillet is worth anywhere from 1 thousand to 15 hundred, all depending on who wants one and when, I have seen them go cheaper but not very often at all. The 13 also came in slant letters and it is a tad less expensive, not much, but a tad, as a rule anyway. And the lid, now thats another story, I'd call the lid rare. Its worth some bucks. I have only seen two or three sell and they go high, around 2 thousand dollars if they are in excellent shape, maybe more, but you have to want one awful bad. If you're a collector, you can buy a few nice pieces of cast iron for the price of what you'd have to pay to own a number 13 lid like you are talking about. Can you post some pictures of your find? Take care and thanks for stopping in and seeing us, stop back, and don't be a stranger. :)