$1 error note, third printing on back

I just acquired this from an auction. I stay with $1 notes in my collection and wanted to add some errors, so I grabbed this and another one. Just wanted to share it. Post your printing errors if you've got them.

 

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Mine on the front, but upside down,

 

I found one like yours. I enjoy paper money errors more than coins, but I collect them both.

 

Mine is an error on Natick Test paper.

 

Could you please tell me more about Natick test paper?

 

@Jersey magic man and @SteveInTampa both have nicer examples than mine. Now I'm envious.

 

I don’t have those errors.

 

Details about the Massachusetts experiment are sketchy at best, but I believe it had something to do with a special coating used on the security paper to help improve endurance.

 

Thanks!

 

Here is a little more info I found on the Natick notes.
http://frn-ones.com/natick.html