Long time Oakley wearer, first time poster. I bought a slightly used pair of polarized black Monster Dogs on eBay, and I am confident they are real after closely comparing them to my old pair of non-polarized Monster Dogs. The polarized ones only weigh 1 gram more than my old non-polarized ones. I am curious as to why the used Monser Dogs I purchased do not have the model number, sizing, etc. on the left arm, but my old Monster Dogs have this printing on the left arm. I've seen a few other Oakleys missing this printing as well. Any reason why these markings are missing on legit Oakleys? Thanks in advance.