aartw - I would strongly advise against trusting
ebay as a reliable stamp identification resource. As you browse through the many topics here, you will find several common threads and one of those is how crappy
ebay sellers are when identifying Classic material!
Please do spend lots of time reading the 1847usa site! It has been invaluable to me. Learn the identifying characteristics of the Bank Notes - colors, grills, secret marks. Do not beat yourself up if paper type baffles you. I
still cannot tell them apart (and in truth, Continental vs National confounds even the experts)! This is despite several years of photo tutorials, face-to-face instruction, written explanations, physical exemplars -- and my vision is good and my hearing is unchanged from my baseline a decade ago!
http://www.stampsmarter.com/1847usa/index.htm