Hi Ringgy,
To check your coin, the first thing to do is verify the Ø : 20.2mm continu with the verification of F#80.1B, if it's not 20,2mm check the F#80.1A versions.
I can't take the measures on your coin but have a look to these pictures which explain what you have to check:
There is one 'visible' point to check your coin: The crown in your coin has beads/pearls in his base, so it's not F#80.1B but F#80.1Ad)
KaterMurr