Inherited silver teapot with ebony handle

I inherited this teapot, it has been in the family for many generations. I don’t know much about it except that it is silver and has a ebony/black wood handle.

Any information about what the piece is and what it is worth would be greatly appreciated.

I don’t know if the mark to the right of the “castle” hallmark is a poorly struck hallmark or just a defect, any thoughts?

Thank you.
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