As Charvel guitars become more desirable, more and more people are finding ways to make fakes or clones to try and sell as original San Dimas Charvels.
JacksonCharvelWorld have a detailed guide of how to identify fakes! Compiled with imagery and details of models etc, it has the most thorough guide on the internet.
Below is an image of one of the many fakes that have been flying round on eBay.
If you look at the image above, the first give away is the distance between the spot inlays on the twelth fret. Charvel knecks are very particuarlar and this is nothing like an original kneck. More details can be found at Jackson Charvel World