chinese plate or bowl more pictures

by leidie
(the netherlands)

Hello Peter,
here are more pictures of the plate .
The plate is celadon colloured
I can't get the mark better in my picture , sorry

chinese plate bowl

by leidie
(netherlands)

Hello,
can you please tell my the age of this plate ?
I don't know if the mark is up side down.
It measures 18,5 cms.