Parallel impressions on a bundle of notes - what caused this? [opgelost]

I bought several banknotes from a seller who is usually good. Four of the notes are one type, the Belarus 5000 Roubles from 2000. On each of these there is the exact same impression, which is two parallel lines running down the length of the note:

The seller says the whole bundle is like this and it is a printing machine imprint from the factory.

Is that a possibility?

These were sold as UNC, is that a fair assessment or are they AU?

odd job

I bought several banknotes from a seller who is usually good. Four of the notes are one type, the Belarus 5000 Roubles from 2000. On each of these there is the exact same impression, which is two parallel lines running down the length of the note:

 

 

The seller says the whole bundle is like this and it is a printing machine imprint from the factory.

Is that a possibility?

These were sold as UNC, is that a fair assessment or are they AU?

 

Yes, it is possible. I have some UNC notes (Hong Kong and Samoa only) and they have these two roller parallel lines across. Maybe the pressure set on those rollers during manufacturing were a bit too much. It is disappointing but nothing you can do much about it. The Hong Kong note was also a high value note too - $1000.😌

I personally still consider them as UNC, just like those cutting cup flaws etc 

Thanks!

The disappointing thing about this is that I already have one other note of this series in UNC and with no roller marks. With the roller marks it will be no good for infrared photography but the worst part is, these notes have very nice anti-Stokes fluorescence. So it would have been nice if they were flat because I wanted to get them imaged on a dedicated unit.

Streaky notes, we used to call them. 

This type of roller mark, though not as pronounced, was seen on some UNC Irish £10 and £20 notes dated 1999. The notes came from a block, which implies that the marks were an artifact from production. I graded them as AU rather than UNC as a result.