This is a Raynaud & Co Ceralene Limoges Marie Antoinette Tea Cup and Saucer.

Set of 4
Each cup and sauce is white with gold gilding.  
The teacup is a footed teacup. 
Measurements - 
Teacup - 
Height - 2 1/2"
Length -  4 1/2"
Width - 3 3/4"
Saucer - 
Diameter - 6 1/2"