Hello and welcome! My name is Doris.I have been an antiques collector, dealer and appraiser for over 56 years.I will be pleased to help you.
Please tell me the diameter of your plate.
To give you the most accurate answer, it would be best if I had a clear photo of the marks on the bottom of the plate.
You may need to use the macro function (flower icon) of your camera to get a good clear photo of the marks.
If you cannot get a good photo, then sketch the marks and take a photo of the sketch.
To send photos you may use the "attach file" or "add file" link on your reply page or the "paper clip" found in the toolbar you see on your reply page.
I look forward to your reply and photo.