JLMenau china bowl

I previously submitted info but dont know if it went through. I am inquiring about a bowl my grandmother gave my sister. It is a JLMenau graf von Henneberg marked  w/C2462/40 (the 40 is underneath the C2462 but it has the slash in frontof it. It also says graf von Henneberg Porzellon 1777 on the bottom. It is in perfect condition and my grandmother had it since like 1940. 

She also has 2 Royal Daulton plates or platters whichever u would call them. And they are limited editons, each a different pattern but both only had 15,000 made each. They both say Hahn Vidal, but the first is "Poets Garden" which is #11,422 out of 15K and the 2nd is "Dreamy Lotus" which is 10,414 out of 15K. One is from 1976 & the other from 1977, unless I read the 2nd one wrong, they may both be '76.

We are very curious about the JLMenau bowl, to see if it is really worth anything.But if the Royal Daulton platters are of value or will be some day, please let us know. 

Good