Below is an example of a "poor mans double die" and this coin is not rare and not related to the 1955 Double Die in any way. In fact, the below picture is of a 1955 with Machine Doubling Damage, or MDD. The die shifted during the strike causing the doubling.

 In true Doubled Dies the die itself has a doubled image so when it strikes the coin, it causes a doubling of the features that are identical in shape and height and width.

Poor mans double die is only a slang term to make the coin sound like a cheaper, or less dramatic version of the 1955 Double Die. However, it is far from rare and not only does it occur in the 1955 but many other dates have doubling in the last digit and many other denominations show the same abraded die doubling.

Buyers need to be aware that this is not a mint error and is considered damage from die hub doubling. It does not add any extra value to the coin even if bidders pay more for this coin.

Many different kinds of doubling are known, strike doubling, abraided die, doubling, machine doubling, etc. and all will show doubling of a letter(s), digit(s) or design element(s). However, all the above doubling types will look flat and often weak. A true doubled design element will not be flat, but rounded and sometimes will make the letters or digits appear split or carved into.

The below picture is not a doubled die because the doubling of the 5 is flat. If it was a double die, the extra 5 would be rounded and raised just like the normal 5.

I hope this guide was helpful. If so, please review as helpful and thanks for reading.

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