www.925-1000.com

I found 3 marks under the tray.







Thanks in advance.

Very unlikely to be solid French silver. I would say it's silverplate.

Hi,
Maker's mark in a rectangle,not en losange (in a lozenge), meaning it is French silverplate.
For more info on numbers and marks used on silverplate see here:
https://www.925-1000.com/a_platenumbers.html
Regards