Identifying a silver mark


I have a broach handed down to me by my family on my dad’s side. It is a crown with 7 points. On the back from what I can read is:
XX1800 and what looks like a flower
Can anyone help identify the hallmark?
Screenshot 2023-12-20 110003

I think they may be cyrillic characters upside down.

Thank you… would you know where it would have originated from?

Sorry, I have no idea. I just threw that remark out as a suggestion but I couldn’t make anything of it myself.

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