Plate

[kardinalisimo]

I am thinking Guangxu or Tongzhi maybe? Is the blue the right color?

[peterp]

Right on spot.

[Stan]

The bottom looks 18th century, the mark is called the endless not.

[peterp]

You are right about the bottom Stan. However, the decoration and mark are 19th century.
The bat underneath the rim is late Qing dynasty.

[Stan]

do you think the decoration could have been added later?

[peterp]

Sure. It is a bit unusual that late, but the plates of the Jiaqing reign, for example, are frequently of a type attributed to the Kangxi-Qianlong period. It is thought that the fired blanks in storage did last for decades after the Qianlong reign.

[Stan]

Thanks for the good information.