Any idea what’s going on with this nickle?

This is a 1940 nickle I found in change. The reverse has an unusual circular pattern in the center of Monticello. Any idea whether this is a mint related error, or most likely post mint? I’m also posting the obverse in case that somehow is relevant. Thanks.
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It has circular damage on the reverse.
Don't ask how it happened, I was not there.
Gumball machine.
Liberty: Parent of Science & Industry
The damage was done after 1940
"Keep your malarkey filter in good operating order" -Walter Breen
Old counting/wrapping machine damage.
Damage to your NICKEL.
Thanks for the responses. Sounds like it was most likely from some sort of machinery post mintage. Appreciate the wealth of knowledge.
That type of damage is not that unusual. As others have said, certain machines will cause the circular marks.
I have a 1939 P nickel that has the same appearance.
Gumball machines in 1940 didn't take nickels. They took a penny.
Pmd, in the PX parking lot, pre Wawa. Peace Roy
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counting machine damage
BHNC #203
They did have vending machines that took nickels then. There was even a big market with them in 1913 when they were designing the American Indian Buffalo nickel.
Definitely PMD... The cause will remain unknown. Good pictures by the way... Cheers, RickO
PMD
Not for penny gumballs though. 5c was like 50c today.
Someone tried to buy a pickle with that nickle and it put up a fight.
Did you ever consider that the 1940 nickel might have also circulated After the year it was minted? The damage could have occurred any year since. I'm embarrassed to even have to say it. When I was a young boy in the 1970s, the small gumballs were one cent and the larger ones were 5 cents. The quarter machines had little cracker jack type toys in plastic capsules. By the mid 1980's, the small gumballs were 5 cents, the large a quarter, and the toys 50 or 75 cents.
Liberty: Parent of Science & Industry
Coin wrapper crimping machines from back in the day consisted of an electric motor with a die sized to fit the coin roll involved. (different dies for cents, nickels, dimes etc.). You would load the coins into a shotgun-shell type paper roll, then push the open end against the spinning die to crimp the end of the paper roll. This is a common cause of these circular marks, usually from someone being a bit too aggressive when using the machine.
RIP Mom- 1932-2012
The only way that would happen is if pre-war nickels circulated in the 60s and we all know that didn't happen. 5c back in the 40s had tremendous buying powers. There were some third world countries were the workers earned 5c a week.
Not sure what a nickle is but your damaged nickel is worth 5c.
Nice lamp

https://www.autismforums.com/media/albums/acrylic-colors-by-rocco.291/
they had vending machines that dispensed more than gumballs, you are the one stuck on gumballs
Looks like Long John Silver to me...
Vending machines never dispensed gumballs nor did gumball machines ever dispense Twinkies.
That gumball machine in the mens room didn't take nickels ... and no gumballs either...
Hoard the keys.
But it pretty chewy.