Zwiebelmuster Tea Set, Original Bohemia Blue Onion Pattern from Dubi

6+6 70230  Cup: Volume : 0.20L, Height: 6cm, Diameter: 10.5cm, Weight: 140g Saucer: Height: 2.5cm, Diameter: 15.5cm, Weight: 180g
1x  70029  Height: 14.5cm Volume: 1.20L Weight: 740g
1x  70036  Volume: 0.50L Height: 12cm Weight: 470g
1x  10033  Volume: 0.50L Height: 15cm Weight: 370g

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/