Looks like there was something on the dial or on the tampon when the printing was done. Even though you bought it second hand, I would at least ask them to replace the dial under warranty when you send it in to Omega for service, as this is clearly a defect from the factory - worth a try anyway.
In my experience, dial printing errors are pretty common. Here is one on a chronograph where the top of the sub-dial and the outer tracks don't line up...
Fibers in paint is a recurring theme, this one on a dial:
But date indicators have this problem too:
Shown this before, but in terms of the hand alignment...
They...
I've also found defects in lume quite often, so this was a dark spot in the lume that was bugging me on this watch:
I thought it might be just on the surface, so I carefully tried scraping it off, but it was clear it was deep in the lume:
I removed it the best I could:
And filled the hole that removing it left behind:
I have similar photos from other brands by the way. These are all Omega, but not all the Omega defects I've documented by a long shot. I don't bother taking photos of them anymore unless they are particularly egregious...
Cheers, Al