I dont want to start jumping up and down thinking i got something here, but maybe just maybe its something special maybe not, But when i look at the reverse i see Another D to the left of the Mint Mark and above it but angled what appears to be an S.
Courtesy merriam-webster.com: par·ei·do·lia ˌper-ˌī-ˈdō-lē-ə -ˈdōl-yə : the tendency to perceive a specific, often meaningful image in a random or ambiguous visual pattern. The scientific explanation for some people is pareidolia, or the human ability to see shapes or make pictures out of randomness. Think of the Rorschach inkblot test.
Just a common worn nickel. What you are seeing is caused by 59 years of circulation, dirt on the coin and a little of your imagination.
It looks like it took a flush hit that disrupted the mint mark. Also appears to be a lightly tumbled coin. Unfortunately, nothing special there. Just appearances of such.
There's a backwards S under the D, do you see it? Don't feel bad if you missed it, we know you're not as expert like we are.
It could be a 2, I don't know, what do you think? I still think it's a backwards S because why in the world would the Mint put a 2 there?
Danny look at these I have which just about the whole roll has something questionable. As many have said many things happened in the process and circulation. We all want it to be something else but we will know when it is. If that makes sense. Look at these about the mint mark etc. Keep searching. Welcome to CT.