Looks like it is a 1909 VDB after all. Here are two links that give more infomation about the coin. The coin looks to have been cleaned.... but if you are the frist and only coin to go to Mars - what the heck!!
For those who do not want to read the whole article here is why for the 1909 which makes a lot more sense now.
Quote: "Originally the Curiosity rover was going to launch in 2009, and so I had planned all along to use a 1909 cent in celebration of the centennial of the Lincoln cent," he said. "I could not use one of the four 2009 cents because we had to commit to the design and materials (i.e., the 1909 is brass, 2009 is mostly zinc) in 2008. When the launch was delayed to 2011, we still went forward with the 1909 cent because we already had it in-hand.
"In fact, we made 4 of these calibration targets, each with a 1909-VDB. One target is on its way to Mars, two others were used in testing at JPL, the other is in storage as a flight spare that could be used on a future mission to Mars, if such an opportunity were to materialize.