Dear daveweight,
Thanks for letting me see that. It is quite interesting. I will follow-up on the Lundberg weights. There is a modern process, widely available, of the laser jet printing of photographs with ceramic colors. These images are produced as a decal which can then be applied to a sheet of glass and embedded in a paperweight. I use this process in my artwork. The older weights must have used a different process.
If I find anything interesting I will post it.