@norm, looks like you have a Buddha Jayanthi coin from Ceylon (Sri Lanka) minted in 1957. Yours was intended for circulation but the proof ones are the coins that are more valuable. To help you with your research, here is the numista link for this coin:
https://en.numista.com/catalogue/pieces15727.html
https://en.numista.com/catalogue/pieces15727.html
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz























