There is a good guide for determining Brush-McCoy Pottery and Brush Pottery fake and reproduction pottery in the discussion forum at www.brushmccoy.com . The posts at this forum will show you the difference between wares produced by these companies, and fakes. It also highlights the difference between authentic and fake marks. If you are questioning the authenticity of a piece you own, you can easily post pictures of your pottery, so others can help you with identification. The direct URL to the Forum is: www.brushmccoy.com/forum.