These two bowls we bought from a dealer in Norway around year 2000. She lived for some years in Beijing and imported a large amount of chinese items to Norway. The larger one is 21 cm and the smaller one is 14 cm in diameter.
The large platter we bought in Singapore the same year. The diameter is 30 cm, and it has got no marks.
With regards
Arne
A better view of the marks
Try to use one item per post, with better images showing more details. The top ones are Qing dynasty, but identification/dating can be inaccurate if details in the image (dragon) tell otherwise. A dragon usually has age specific features.
The plate at the bottom is difficult to identify with these small pictures as neither details of the decoration nor the foot rim/base are clearly visible. Could be Japanese. Better make a new post for this one.