Sorry to rock the boat but, if it's purely a VEB Ankerglas stamp, then why is it on the other two pieces that I mentioned yesterday (Lausitzer "Florenz" and the Sachsenglas bowl?).
I know that VEB Lausitz and VEB SG had identical designs in their catalogues (Lyon, Verona, Brilliant, amongst others). Were their moulds also used by VEB Ankerglas? Or did the 3 VEBs just sell each others' products under their own labels? Perhaps a way of making it seem as though there was more DDR product than there actually was?
The circular FOREIGN stamp may have been something that was applied to DDR vases being exported to the West -- although W. German pottery in the post-WW2 period was also just marked Foreign to conceal the fact of their being German.