Weight it and calculate price for .900 gold medal. If you can find who released it and if it is really gold.
It is not a coin. I would suspect that it is commemorative medal after him visiting your country. Multiple medals commemorating him on numista, but your is not there. He died in 1967. So no reason to put 1966 apart from visiting Israel.
Not related to Israel. Should have searched for images instead of trying to figure out what the date is. Aureus Magnus. Google image search identified it when fed only coin image.
Weights in original post would indicate that it is 10 ducat variant.