Silver paper knife / Dirk?

Hi everyone. I have very attractive silver paper knife / dirk made by MacKay and Chisholm of Edinburgh.
It is hallmarked for Edinburgh 1907 and is 23.5cm in length and inlaid with 3 agates and topped with lovely champagne citrine stone.
As you can see the workmanship is beautiful and this is the only one I have come across. A rough valuation and any additional information would be greatly appreciated.
Thank you in advance.
paper knife.jpg

Anyone?

Sorry, doesn’t seem like anyone feels like a punt on this one.

Just looking for a rough estimate? Or any additional info.