Zwiebelmuster Coffee Set, Original Bohemia Blue Onion Pattern from Dubi

6+6 70227 Cup : Volume: 0.12L, Height: 6, Diameter: 8cm, Weight: 100g Saucer: Height: 2.5cm, Diameter: 13cm, Weight: 120g
1x  70025  Volume: 1.55L Height: 24cm Weight: 910g
1x  70037  Volume: 0.20L Height: 10cm Weight: 270g
1x  10033  Volume: 0.25L Height: 12.5cm Weight: 240g

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/