Genuine or fake?

Guys, I've got a weird one here. I recently bought a coin thinking it is this one: https://en.numista.com/catalogue/pieces85756.html

Everything seems to correspond to that coin's description in the numista catalogue, apart from its size. Mine is not 17mm, but 34.5mm. Weight seems to be about right, at 7.92g, my year seems to be 1831. I can't figure out if it is a fake and I don't have Krause's catalogue at hand to check.

Thanks!

With 34.5 mm and 7.82 g it should be this one:
https://en.numista.com/catalogue/pieces32204.html
You said "weight seems to be about right" but the coin in your link weighs only 0.8 g!

Verweis : "Essor Prof"​With 34.5 mm and 7.82 g it should be this one:
​https://en.numista.com/catalogue/pieces32204.html
​You said "weight seems to be about right" but the coin in your link weighs only 0.8 g!

​Ugh, sorry, my mistake. I thought it was 8g not 0.8. Thank you!