Above another of Nana's tiny teacups sitting on its little "riser".
With a ruler you can see that the plate is barely three inches across. The same detail on the little saucer is repeated on the inside of the tiny cup.
Cup & saucer together, view looking down you can see the shape of the cup and the inside details matching the tiny saucer.
And finally the marking on the bottom. Most of Nana's tiny cups have some sort of mark on the bottom simular to this one.