Not double struck or an error your coin is a vise job(damaged).Someone deliberately forced two Nickels together to cause the imprint.Its actually quite obvious because you can see the spot on the obverse of jeffersons head and the reverse effect lines up also from the process.Whats it worth?5 centsyou'll find something eventually though.To question this coin is a great start and your getting on the right track. https://www.error-ref.com/squeeze-job-or-vice-job-or-garage-job/
With my current eye issues due to new medication, I first thought the obverse was a lamination, but then seeing the reverse, I read @potty dollar 1878 and @Kentucky post and had to enlarge the photos and then I could see someone tried to superimpose a reverse nickel on both sides. At least @Electricianmagician came to the right place to learn. Good job and good luck. Please, next time post your photos Full Image and not thumbnail. Thanks.
