The question for me is rarity. After all, aside from the obvious passing of time, that's what makes a vintage piece vintage. If older Oakley was available at any store or website, it would not be "vintage," it would just be "old."
I was overwhelmed with this the first time I browsed the OR. I saw so many pictures of older items that I had never seen before. To me, it was classic Oakley captured in photographs, and to others, it might just be older pieces of their collection.
A hard to find item that is in mint condition is the epitome of vintage (especially in the realm of collecting). Let's just not let it get to the point that we bring up the word antique!