Prettty Cup, I have come across a number of Royal Crown items. I have had little luck pin pointing the company. First I pretty sure Royal crown, is not the same as Royal Crown Derby. Even though both are based in Staffordshire. I have found reference to Royal Crown Items from many countries, Japan, China, even the US. My best guess thus far on Crown Royal items it is a Large Export Company, and uses the much popular Crown Logo, and many get it confused with Royal Crown Derby, which are very collectible and hold moderate Value. Also don't get it confused with a Crown Staffordshire either. With the Reg. mark also included on the back stamp, would Likely date this to within the last 30 years. Oh also I have found one reference to the Company in one of my book, if I remember right it said something like they made Porcelain between 1952 to 1957 I think, it's Location was not staffordshire. Just though I would give you a few thought on my looking for the Crown Royal Hallmark. Over all you have what I call a Fancy Cup, which hold value just from the overall looks. You have Plain Cups. Fancy Cup, and Extra Fancy.