http://reviews.ebay.com/Coach-Serial-Numbers-the-Basic-Facts?ugid=10000000034886433
In your examples, the D and E are the months, April and May. 09 refers to the year 2009. 20 and 71 are the plant codes. The F before the style number refers to Factory, meaning these were made for factory.
Wow, awesome ... thank you so much. One quick one, made for factory is for outlet not for retail? TIA