Royal Mail letter opener

[ScouseDuke]

Hello,
My father recently passed is down to me, and I am trying to place an age on it. I also curious about what value it might have. It has been in my family for a while. I am just not sure how long exactly. Any help would be appreciated! Thank you.

 

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[Old Bookaroo]

That is pretty cool! Looks like it came from one of those English mystery novels - "The body was found in the library, lying across his desk, with a dagger of Oriental design in his back..."

Good luck to all,

The Old Bookaroo