Offset Printing Error

Here’s my latest buy. An Offset Printing Error graded by PMG as Very Fine with a point system of 25. Most of the front is also printed on the back of the note. It’s a series 1988-A on a Twenty Dollar bill.

 

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Great looking error right there, first one I've seen in 70 plus years!

 

I do have a few others with the same error but this is my first twenty dollar note. I’ll check to see if I have any of the others.

 

Here ya go @fretboard, I found one of them. The front of the note also appears on the back of the note. It’s almost a complete copy off the front on the back. Very nice to see in hand.

 

Here is one on a star note.

Here is one on a fifty star note.

 

Your 20 note looks like a back cylinder strike as the stock folded over. The note's second image is very dark with nice detail.
To me it's not an offset error. I'd call it a, in line press error.
45 years a Pressman.

 

Could you please explain what a line press error is and how it occurs?

 

Nice errors @Collecting Nut & @Mountain Man !!

Here's my favourite Offset printing error:
the front of the 1979 Bank of Canada $20.00:

and the reverse, with the error (note how every thing is inverted). This would be considered a 75% or more offset error.

On a side note:
I sold all my large denominations (Fifties & One Hundreds) to buy the above note about 25 years ago. Glad I did!