the obverse looks like a die clash of the Roosevelt dime with the reverse of a Jefferson nickel somehow. Don't know about the reverse.
Everything I saw was the same coin, as in the reverse on the obverse of that same coin. I saw nothing of 2 different denominations clashed
I’d bet glue with the second coin pressed into it leaving the impression. See how the letters on the nickel impression are backwards? Good indication two coins were squeezed together. I feel like I keep raining on your parade tonight… lol
A bored person or kid That is adhesive on the surface of your Dime. Not a mint error of any kind. @Millard It is not a Die Clash.