Decorative Knife Identification?

So i've had this knife for quite a while, and i know very little about it. I think its copper based on its oxidization in the stamping. I got it from a VERY old Veteran who said he got it overseas, though i don't remember where or when. I think its some sort of recreation peice because of what i THINK is crude welding near the base of the blade (im no welding expert). One one side, its stamped with '1821', the other has writing i don't recognize.

 

it's a souvenir...

 

Welcome threelegmeg.

It is a brass commemorative dagger-shaped letter opener of the Greek war of independence against the Turks, which started with the Revolution of 1821.
It dates from a later period and would have had a decorated scabbard as well. The writing says Ἑλλάς, Hellas, the old name for Greece.
Here is some info:
https://www.ahistoryofgreece.com/revolution.htm
Note that Laskarina Bouboulina, one of the women heroes of the revolution, has a dagger like yours (a real one):

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Any Jewelry, I agree fully with your explanation, but the thing Bouboulina is wearing is rather a gun, not a dagger... This decorative piece looks like a copy of a "Pala", a sword used in the Greek revolution...

 

Thank you for your help! I was pretty sure it was a recreation knife but i wasn't sure what it was exactly or what it was used for. Souvenier or not, i think its pretty cool, regardless of its lack of age ^^