Found in a penny roll.

[tellurianpearl]

I found both these two coins in the same penny roll. The first two pictures show a 1992 Lincoln Cent with a split blister like clip shaped indentical to the size of Lincoln Cent. Is this just deterioration? The remaining three images are of letters from a 1967 centennial Canadian Cent. Typically the text style is slender and strong. If this was machine doubling would not the lettering become ridicously skinny and start to disappear as the majority of the time machine doubling removes part of the design/text?

[tellurianpearl]

Any input would be gratefully appreciated.

[JR Emery]

Greetings...
The 1992 Lincoln cent would need a closer examination... the photos just doesn't give a good view and detail.
As to the other three photos of the Canadian coin... you were correct in the opinion that it is machine doubling. The dentiles have the same shelf like image to the left as the letters.

[tellurianpearl]

Thank you for your response.

[jcuve]

The 1992 appears to be damaged; and in that condition it would be hard to establish anything beyond damage.

The Canadian coin, as noted, shows machine doubling.

Thanks for sharing!

[mikeellis]

I have seen this on hundreds of Lincoln cents since 1982. It is corrosion from any number of liquids. A couple of these get wet and are overlapping. They stay wet for a fair amount of time. Then, most of the time they get stuck together. What you see is where one was stuck to another then pulled apart. The bubbling is unique to the copper plated zinc cents.