all of the 2012 polos have the Swoosh on the front and the TW at the back collar.
none of polos released to retail prior to 2012 have the TW ribbon logo on the back. those were reserved for specialty vendors, and, for the most part, are very hard to come by. you can find them on eBay from time to time, but i strongly recommend you get up close shots of the TW ribbon, as it is often done aftermarket as opposed to being done by the regular embroiderers.
one other thing is, the 2012 polos do not have embroidered Swoosh and TW logos. they are screened onto the shirts now.
i have quite a few TW polos. while most of mine are not retail releases, i just happened to have a couple pictures of one of the 2012 polos.
there is a very reputable seller on eBay that sells TW shirts with the ribbon logo. he's a friend of mine, and i would highly recommend him when looking for polos prior to 2012 with the TW ribbon logo.
you can also purchase from him directly on his website where you can get 10% off his eBay prices.
his name is Matt, and he runs one of the best sites for exclusive TW apparel.