Antique tea cup from Versailles?

Hi, I have a flowered blue, white and gold tea cup with a stamp on the bottom that is in an "X" shape the top of it has a crown like smbol, the left has an R and the right side of the "X" shape has a "G" or "a" then underneath of the "X" it says "VERSAILLES". Also on the bottom is a number "2888" and there's a date of 1765 on the cup. Does anyone have any ideas about this cup? Thank you :)