Welcome aboard. Contemporaries are hard to ID if the initials aren't on it. There are so many Artists and it's hard keep track of them. Keep posting pictures. Your pics are excellent 👍
I always like what I would call crude glass marbles. I see this in the seams and really like that kind of trait. The slightly dull cutter Lashes in pic 4 and 5 are another nice flare in this marble. Pic 6 is juicy. 🚀
I see more Vitro seam traits here. Similar to Du-Lites and all the other Lites. Several of these have 2 seams. I would need to see some 2 seam Jabos that might be similar to these for comparison.
Does anyone have examples of Grenier slags ? They are the only factory I know of that made a single pontil slag in Germany. What traits would one look for when trying to sort these types of slags ?