Trying to establish if my crown coin is genuine

Hi

I have a Elizabeth 1 Crown which I believe to be real but there is conflicting information on the internet so I'm not sure if it is - has anyone got any advice. The coin weighs 19g and is silver, it varies in thickness from 1.6mm - 2.0mm around the coin and has flat edges and overall diameter is 42mm.

Thanks

Need better images ..

Цитата: "derf"​Need better images ..

​Ok thanks - struggling to get a better photo quality but will keep trying

The weight of a genuine crown is 30g.