Ok. I know most of the tag has visible serial number outside the cover at the back of the watch. Mine do not have it. The cover has embose with the image of Juan Manuel Fangio but no serial number. Is that possible?
If you include some pictures of your watch, it would be useful. For instance, in this Carrera Fangio (CV2014) the model number and the serial number are clearly visible:
Yes @Torque , this is clearly a fake watch (the caseback is better copied than the rest of the watch…), so the counterfeiters forgot to add a serial number.