Hi Peter, Do you have any idea how old this plate can be? It's very interesting. The subject seems European, but the back marking is definitely Chinese.
Hi, the pictures are too small to see any details clearly. Some closeups would be needed. The mark is a Qianlong mark which may be spurious. A closeup picture of the foot rim would also be needed. From the picture it looks as if the rim was "made" to look old.