FAO Forestry Congress CERES medal 1972

I have a very large CERES medal same design as N#90101 and I can find no information about it. It was sold to me as silver, it has a 67mm diameter and weighs  221 grams. I don't have it to hand at the moment so I can't take any pictures, but is identical in design as the one I mentioned. Anyone have any information on it?

Hello 🤖

Without pictures, it will be very difficult for anyone to help you. Could you please post clear pictures of each side of your item?

Please note that this is an automatic message. Feel free to ignore if it is not relevant.

There's a bronze version that's 68mm dia.  Maybe yours is silver plated?

I have taken a few pictures now, but the light is poor and I only have a phone. I did take it to a bullion dealer, they used an XRF machine and said it was silver, but didn't mention purity. There are marks on the rim, but couldn't get the phone to focus using macro, but one mark is the date-1972. Last 2 pictures show size in comparison to Russian 3 roubles and relief of medal.

Managed a pic of the mark on the rim, hope it's clear enough.