My mom has had this porcelain plate on her wall forever.
It measures 38 centimetres by 28 cm. She told me it was a strainer of some kind, It is in perfect condition with no chips or cracks.
I have enclosed a photo of the marking, which also says "Wedgewood" pressed in the back.
She would like to know how old it is and what value it would have.
Your mom is correct. It is a strainer that would fit into a matching serving platter. The holes would allow the juices to flow through to the bottom platter. It is known as a "mazarine."
They were popular in the mid-1850s.
They are very hard to find with the matching platter.
It would have a value of $200 to $225.