You can read the history on Petrus Regout and Maastricht on my website
http://www.mygrannysatticantiques.com/html/porcelain_pottery_china_marks_2.htm I also have a couple of photos of marks used by this company. The marks shown are not the only marks used by this company.
My experience with Maastricht and Regout is that the items sell very well and for decent prices. I have sold dinner plates for up to $40 each. Price depends on where you are going to sell them and the condition of the wares.