If you are in Cyprus it is highly likely a pre 1990 car was set up to use both types of petrol. Look under the bonnet and see if you can find the EZL octane setting wheel.
Like so


If there is no sticker in the fuel filler that states unleaded fuel only then it is very likely that the car will run on both.

I once owned a 1988 European 190e 2.6. No cats, no oxygen sensor and adjustable octane wheel. Car was designed to go anywhere in the world. - especially to third world countries where petrol was very iffey.