Hello to all,

I need to identify the marks on porcelain plaque(see image).
The marks are 3 “x” signs.
Is anybody who may help me to identify mark on porcelain plaque?
If so please so kind to answer on my question.

Thanks beforehand. [img size=431]https://kovels.com/media/kunena/attachments/legacy/images/004.jpg[/img]