Coin authentication. Braunschweig-Calenberg-Hannover 2/3 Taler 1807 GM Georg III

SyrexCoin

Hello Dear colleagues.
I created this topic to listen to your professional and independent opinion about the authenticity of Brunswick-Lüneburg 2/3 Thaler 1807 Georg III.
My position is to defend in principle that the coin is genuine. The coin was found with a metal detector. Single-stamp coins in comparison will also be shown in the photos. The coin was successfully slabbed in NNR, but the RNGA said not genuine (without explaining the reasons). I will be glad of your professional opinions

NNR - sayd GENUINE, RNGA sayd NOT GENUINE

And the comparison of this coin with similar single-stamp:

bidask

Send it to PCGS and see what they say

lordmarcovan

What are NNR and RNGA?

I'm not seeing any photos.

tcollects

@lordmarcovan said:
What are NNR and RNGA?

I'm not seeing any photos.

Russian NGC and PCGS

lordmarcovan

I see the photos now. They weren't showing up when I was online from work.