They might look like the Noble Collection coins (more aged), but not like the Weta ones (which are rather shiny, and which I have).
Noble Collection:
http://www.noblecollection.com/Item--i-PRP-HB-6087
Weta:
https://www.wetanz.com/smaug-s-treas...ffiliate=14810
As for the image likeness - well, they are originating from the same prop molds, aren't they?
PS: as I see on the Certificate of Authenticity, these are in fact the Noble Collection coins.