1951 Nickel question

[Rachel68]

I have a 1951 nickel that has an error (filled in) 5 in date. Not sure if this would be deterioration or an actual error. Can't imagine it being deterioration when the top of the 5 looks like it was squished at time of minting, but could use a little help from people more knowledgeable than I. I'm still a novice.    Any help is greatly appreciated.  

[Crawtomatic]

Notice the top of the 1 and 9 exhibit the same squishing and marks moving left to right.  This was all damaged later in life but not at the time of minting.

[Rachel68]

Thank you. Is it worth keeping though?

[Crawtomatic]

8 minutes ago, Rachel68 said:

Thank you. Is it worth keeping though?

That would depend on you.  There's no real value to it numismatically and you could get a mint state 1951 for less than $3 probably.