This one is relatively easy: They are Chinese clinchers! I'm not saying this is a bad thing, but you just need to know what you're looking at.
For Starters, and as another poster above pointed out, the hubs and spokes are usually the first place to look.
Take a look at the hub and spokes on a real F6R here (link below). The spokes are silver Sapim (I think) and the Hubs are clearly DT-Swiss.
http://www.ffwdwheels.com/wheel/f6r-ffwd/ Now, let's compare with a Chinese special version (link below)! Notice in the picture that the knock off is using wide, flat bladed, and black color spokes. Also notice the flanges on the Novatec hubs. These two things are very easy to compare with the real deal.
https://ca.dhgate.com/...EAh2_lhoCfQsQAvD_BwE Clearly, the pictures you've provided show the flanges of a Novatech hub, and wide, flat bladed spokes. Therefore, it's almost certainly a fake.
For knock-offs, $300 still isn't necessarily a bad deal, but it depends on your perspectives on these kinds of things.