This differs from the Feinstrich label on my own dish and I would guess yours was a later one. Although I have nothing more to offer on this company, I notice a few auctions on eBay Netherlands and Germany:My dish features in the book, but was incorrectly named Feinrich - in fact the correct name is Unionglas Feinstrich and it was based in West Germany.
http://cgi.ebay.nl/ws/eBayISAPI.dll?ViewItem&item=130172951948
http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=130172951920