Folks seem to keep posting images and/or serial numbers of supposed Apple devices/items asking us to determine if they are fake or original products. As such, there is no way anyone here can determine that from an image or serial number. You, yourself, can determine if the serial number is one that Apple recognizes here:
• Check Your Service and Support Coverage - Apple Support
However, serial numbers for Apple power adapters cannot be verified at this site. But, even if they could, it may still be possible that then number itself was faked.
The bottom line? If you purchased this item directly from Apple or an Authorized Apple Reseller, then it should be an original product; if not, then chances are that it is a fake.