Whats the deal with JFK Sides

[Bseymour5]

What are the deal with the ones that look smooth on the side. My father who goes through them with me is convinced they are mint errors.

 

[NaturalJWL]

Casino coins, slot machine damage.

 

[Diver_Down]

Popularly called "Casino halves". Fed into slot machines day in and day out will cause the reeding to wear down and make them smooth.

 

[fistfulladirt]

We can supply your father with all the mint errors he desires, for a slight premium.

 

[captainfwiffo]

There is a type of error called a broadstrike that can cause this, but 99.99% of these are casino coins.