Pamela, thanks for so much effort. I'll tabulate them and do some html and then I think we will have a very interesting insight.
The mark 'Pavillions' is completely unknown in literature, and quite special information, since we know of NO genuine mark from this factory (i.e. Pavillions á Beignée (Manage)). It could be a vital clue, so a photo of that mark would be very useful! We have little info about the factory, and cannot immediately exclude the possibility that they are 'players' in this story.
I also talked to both Ann P and Eliane B, from which some more clues have been found.
In general I think all are agreed that, despite the variation in the markings, these are all examples from a single source, made during a longish period. (and no evidence it was in Belgium)
Although we all suspect the culprit, there is now a chance that we can actually prove it! (I'm chasing after that story, now...)
Once I can get all the information online as a draft, I will post the link here for you (all)