Zwiebelmuster Wanderer 17cm Original Bohemia Porzellan aus Dubi
Zwiebelmuster Wanderer 18cm Original Bohemia Porzellan aus Dubi
The product is very safe to use - more at http://www.zwiebelmuster.eu/zertifikat-zwiebelmuster/
In Czech Republic, There are many producers of Blue Onion Pattern, but only Bohemia Blue Pattern from Dubi using this trademark:

The trademark has been modified over the years. More you can find here: http://www.zwiebelmuster.eu/geschichte/