Subject:Re: Chinese porcelain
Posted By: I.Nagy Tue, Nov 12, 2019
The oval marking reads,
乾隆御覧之寶 - Treasure seen by Qianlong
This seal was affixed mostly on paintings and calligraphies.
仁作 - Made(Written) by Ren
世寧 - Shining (Painted in (Lang) Shining (郎）
世寧 style is the meaning, Lang Shining (Giuseppe Castiglione a Jesuit missionary 1688-1766 served as artist at the imperial court blended the European style with Chinese painting styles, creating unique works)
I am not an expert on ceramics, therefore I leave the further evaluation on more knowledgeable members.