D means it's a 2013. They put it at the end of the model code, it's usually on the decal under the seat which indicates the colour code. It's also the 10th digit of your VIN number.
must be something new honda started doing ?, all old models ( old school ) don't have any letters for the vin number in the model quote. see..even I learn stuff here !..lol.
Honda has been doing that for a long , long time --- but for some strange reason they don't do it every time ---- I have had about a 50/50 % ratio of bikes with the year code letter on the back end of the model and some not ---- Shade , you and me posted about that letter before --- an old mechanic I worked with years ago told me " Son , I forgot more than you will ever know " LOL ---
it must be a state thing ?, because they don't do it around here, least I have not seen it ???.