Check pet shops and animal souk first and call the vets as if someone finds him they will probably go to the vet for food and toys. If they have seen him, you can call the Police and they will check your photos to prove he is yours and then force the people who found him to hand him over. When attractive cats get lost, they are usually found and cared for rather than suffering on the streets. I hope you find him, I am going to the souk tomorrow so I will take a look.