I think they make them like this in the Far East to simulate ageing -
If what I am seeing in this picture, … that this
ceramic vase was first painted green, … then the glaze was added, … then the vase was “fired”, ….. and then the bottom was ground off so that it would sit flat on a table, …….. would not, IMHO, … be done to simulate ageing.
Now iffen it was a
glass vase, ….. instead of a
ceramic vase, …. then I would agree with the “ground bottom” thingy.