Zwiebelmuster Soup Cup no Handles + Saucer, Original Bohemia Blue Onion Pattern from Dubi 

Cup: Volume: 0.30L, Height: 6cm, Diameter: 13cm, Weight: 240g
Saucer: Height: 3cm, Diameter: 17.5cm, Weight: 230g

The 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 to interrupt the 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/