Hello all,
This is probably a dumb question but....
Is there any way of checking if a paper join is done by the printer or not?

I have a join on a Machin coil and though I have no reason to suspect it is done by anyone other than the printer, I cannot guarantee it. This came from a long strip from a coil.

I have also illustrated an Australian example, also from a coil. This one I know is genuine as I had the complete roll myself.
Again I cannot prove this, though a close inspection shows the join has been perforated which maybe lends credence to it.

I have tried our friend Mr. Google but cannot find anything to help.
Any pointers or information would be appreciated.

Ron.