Beautiful little tea or coffee set!
This set is marked only with an incised #800 on the bottom.
I found the same mold in Playtime Pottery & Porcelain from Europe and Asia by Lorraine Punchard, page 105.
Service for 6 includes:
5-1/2" Covered Coffee or Tea Pot
3-1/2"" Covered Sugar (cover broken & glued back)
4" Cream pitcher
2" Cups (2 cups with rim chips)
Please click on the big picture, you can get an even larger image to view condition and all the details.