I found the source for those specific seal images, they were on pinterest. Lietuvos muziejų kolekcijos (Lithuanian museum collections).
They have nice high-res images of various seals that were affixed in this way, presumably to collect them for the museum.
Here is a link to the museum digital collection for anyone who wants to browse them (p60-p76 have seals, maybe later pages do too):
You are not allowed to view links. Register or Login to view.
I will say that many of these examples show similar cracking as our AG seal and many have similar looking cardboard underneath.
They have nice high-res images of various seals that were affixed in this way, presumably to collect them for the museum.
Here is a link to the museum digital collection for anyone who wants to browse them (p60-p76 have seals, maybe later pages do too):
You are not allowed to view links. Register or Login to view.
I will say that many of these examples show similar cracking as our AG seal and many have similar looking cardboard underneath.