Unfortunately the news on this one is all bad. This was, and still is, the most often counterfeited Prada style ever. They sell for around $39 on most counterfeit sites, and are indistinguishable from the authentic ones in most photos. Even handling them, sometimes, it is hard to distinguish the real from the fake. The proportions of real to fake in the market place are about 100,000 fake to 1 authentic. So you can see the enormity of the scale of the fraud.
Having said all that, I don't believe that this one is authentic.
Thank you so much for your help, I had no idea there are so many counterfeits of this bag. I really want a vintage one but maybe should just purchase their re-edition 2000 bag in full rather than search for a vintage.