There are a lot of fakes out there - probably 99% of the DW-6900 Bapes are fajke on eBay. Sometimes the seller is smart enough not to use the word "Casio" or "Bape" in the listing so they can plead that there is no copyright infringement if eBay threaten to close their account.
The standard listing, in the UK at least, is from someone with low feedback showing an out of focus photograph of the watch, making it difficult to see where the date is located , the smarter ones show a clearer photo with the watch in timer mode so that the digits look ok. The start price is often laughably low and little detail is given about the watch. Yet people still fall for these ads.
If you use the "report this" link on the eBay listing it brings up a page to select reasons for your report, select "Counterfeits and breach of copyright" from the drop down list, detailed reason as "Potential Trademark Infringement", additional information "Counterfeit watches and jewellery".
Then add your reason for the report - they only give you 40 or so characters to do this and send. Just done it for the pink bape listing, interested to see what happens.
Here is
one that looks to be the real thing, just don't get scared by the price!