Three Memorial Cents with identical mechanical tripling

I have three 1960-D cents with the exact same mechanical tripling. Is this unusual? On the reverse the word States has tripling.

 

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Here is a close up.

 

I looked, cleaned my glasses and still don't see strike doubling, aka machine or mechanical doubling.

 

Thanks Sal. Here are some better pictures.

 

I'm assuming, normal for this to happen. Awaiting more answers.....

 

At first I was thinking a combination of MD and "ejection doubling", what I've been calling the thin raised lip of metal usually at the tops of letters or the date digits. I put together a zoomed collage of your TE.

Then I looked at Heritage archives and there seem to be a lot of them. Example: https://coins.ha.com/itm/lincoln-ce.../132506-21081.s?ic4=ListView-Thumbnail-071515

A lot of them in the PCGS gallery show it too.


I can't explain it. Seems to be common.

 

Thanks for the feedback. What I thought was unusual was finding three coins with virtually the same characteristics. I did get them in a bank roll in 1960. They could have been in the same manufacturing run. So, how does the mechanical doubling process create identical coins?