I don't see the usual "Designed by Apple in California" sentence. Are you sure this is an original charger?
This charger came out of a brand new iPhone 5S box purchased in an Apple store in the USA.
Apple then shipped a lot of generic low quality chargers? Can anyone else please check theirs? This was purchased in late June 2014.
Also found this: http://appleinsider.com/articles/13/07/25/apple-warns-chines...
Mine definitely looks like a generic one cautioned by that article.
By the way the sentence “CAUTION: For use with information technology equipment.” also appears on legitimate chargers, so that isn't a sign of anything.