Its damn beater... Well u should ask for the receipt or any proof of purchase and will be fine. Make sure u negotiate properly, with 170 u can get a better shape of Concord pre-owned.
The bubble supposed to be yellow-ish colour... But the only different tag that i got is a black one from nike, cause it released in hongkong/macau. Other than that its good to go for me. Make sure if u did purchased it to take last picture with your name on it so you know that is the real deal...
It look fine to me, just make sure the stiching are fine and all the small details, from boxes and also production dates. Theese are mine u can cross check