Zwiebelmuster Teeset Duo Original Bohemia Porzellan aus Dubi 2. Wahl

Volume: 0.45+0.25 L
Height: 17cm
Diameter: 15cm
Weight: 780g

Painting (Onion Pattern) is under the glaze which makes the product safe to use in microwave and dishwasher. Breaking the product with a force is the only way how to interrupt painting.
(Glaze is thin, clear, and protective material applied to ceramics)

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/