I'd say that the mark on the item reflects that of one of a copy of the mark of the Qianlon emperor (ruled from 1736 to 1795) , as in : a copy , non-original .
The genuine article (mark) is generally done in blue & frequently 'raised' within the porcelain .
The genuine articles were painted with a much more artistic & skilled hand !!!
I couldn't tell in the ebay images , but it's also a bit of a 'tell' if you can spot any grinding-away of excess glaze @ the base of such period items (should not be ground-down , as this is caused , generally , from slumping/excess glaze ... not hi-qual craftsmanship) .
That's my 2 cents on the item , jumpontopski .