The 1955 cent was once encased, usually as an advertisement or a "lucky penny". The flattened rim can give the appearance of a coin struck on a type 1 planchet.
They might have look like this before the damage was done: If you have one of the ones still in the holder, leave them there. At least there is some value in the holder. Out of the holder, they are just a damaged coin. Regardless if the coin is not circulated. They just a still just a damaged coin taken out of the holder.
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