I left this one off, and I couldn't get it to edit. So here is one where you can see the same type corners really well.
http://www.ebay.com/itm/BLACK-VINTA...975?pt=US_CSA_WH_Handbags&hash=item3f179c7047
Vintage Coach Handbag
Seller: jdbass
And on the Coach site, the classics, it looks like the new ones may be like this also. I won't post any more pix. But I thot this would help.
Ok, I checked all the ones listed, and although there are several fakes 9870s listed, yours actually may be genuine.
First of all, the differences:
edging and piping at top of the underflap panel and underflap pocket is different
placement of the top of the back outside pocket is high
placement of the creed stamp is low and off-center
font of the serial number is vey large
sewing and padding of inside bottom doesn't quite match the others for sale
BUT
there are two others with the same kind of stitching and piping:
This gray one has the same problems with the top of the panel but the serial number & creed isn't readable. The creed is unusually puffy and that could mean it was made in China, or it's fake. Contrary to what some so-called authenticity guides claim, early Coaches from Chinese plants made in the early 2000s DID have puffy creeds, even some af the leather ones with stamps on the pockets instead of patches:
http://www.ebay.com/itm/BLACK-VINTA...975?pt=US_CSA_WH_Handbags&hash=item3f179c7047
But this is the one that makes me feel yours may be genuine. Not only is it from the same plant, but the month and year code are different, it's a year older. Fakes makers almost never bother changing month & year codes, they just reuse the same exact number over and over. This one has the unusual stitching at the top:
http://www.ebay.com/itm/Coach-9870-...665?pt=US_CSA_WH_Handbags&hash=item564a8a7e01
So while there's no way to be 100 percent sure, the same details on an apparently genuine bag make it less likely that the one you bought is fake. The G plant was a newer one and apparently wasn't open for very long, so their Quality Control wasn't at the same level as you would have expected from a plant where the employees had a lot more experience.