That's it confirmed then

I imagined I did see the Onderdendam cancel inverted (from a bleed off), but it was a bit difficult to say on my screen.
I have a few old French covers with similar bleed-offs, I find it to be quite an interesting feature, and not the least detracting for the covers appearance. The bleed-offs kind of take us back into the postoffice at that time, and reveals how the postmaster was striking away with his hammer, and pilling the fresh-cancelled covers on top of each other.
Some consider these fuzzy/blurred bleed-offs to make the covers less clean and hence less attractive - but I am thinking quite the opposite. 'Philatelic covers' may have perfect
postmarks and no such 'ink mess' - almost like a letter-version of a CTO stamp. Proper postally used stuff, on the other hand, look even better after a few 'rough days' during transit
