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?

 

I'm no expert, so you can discount anything I say about it. But suppose it is not mechanical doubling but die deterioration. Then all coins from that die would look pretty much the same.

 

As I noted above, there are tons of 1960-D coins with the same raised line of metal along the tops of particularly the Ts and E. It may look like "doubling" but I don't think it is. I just looked at GC archives and quickly found several more. Whatever it is, it was either on a lot of dies (even the master perhaps?), or something about how they were struck caused it on a lot of coins. I'm seeing it on 1961-D as well.

 

Thanks for all the feedback. I think I understand the process a little better now.