I haven't cleaned the pan, Steve.  It doesn't look like it was used and yes, the rust looks new.  I don't think the seller was the sophisticated type to add intentional rust (I chatted with her a bit over the purchase).
IMO, the casting and finish are pretty darn good, especially the bottom.  Does anyone here have a certified reproduction of this pan and can post a photo, or vice versa (a known authentic Martin pan)?