This watch is obviously a cheap replica. However, as a watch enthusiast, I can tell you that spotting a fake Rolex can be tricky. Some fake watches can look almost identical to the real deal, but there are usually some telltale signs. For example, the weight and feel of the watch may be off, and the movement inside may not be as precise as the real thing.
If you're unsure about the authenticity of a watch, you can always require authentication at places like pawn shops. They have experts who can tell you if the watch is genuine or fake. I found this website, newbondstreetpawnbrokers.com, that provides watch authentication services, and they're known for being reliable.
In any case, if you're not 100% sure about the authenticity of a watch, it's always better to err on the side of caution and avoid purchasing it.