Seller "coincidence4you" has been reported by me several times to eBay, with almost nothing being done about it. This seller has several altered coins for sale, including struck in and retained staples, dual denomination brockages, and this dime struck on a 2018-D cent double denomination. The problem is, this error on this coin is not possible. Here is the coin... Here is the problem. A reeded dime collar is too small for a cent planchet to fit inside it. Notice how the copper cent doesn't fit in the dime collar below. (The dime would fit if the dime collar wasn't torched/destroyed, which was done to prevent re-use outside the Mint). In addition, even if it did fit (for example, zinc coin metal stock was fed into a dime press punching dime-size blanks) this coin should have reeding on it; it doesn't. Here is a closeup of the reeding pattern inside the dime collar, which should be on the edge of that cent but is not. Sadly, with just a few hours left, that altered cent is currently over $1,300. As Fred Weinberg said, this coin is going to "be an expensive lesson for someone." I believe this was struck with fake dies as the dime designs appear raised. Avoid any and all error coins from eBay seller "coincidence4you".
There is also a backwards rotated extra shield on the reverse that looks to be in reverse relief. So another penny was squeezed on there at one time.