It has become more & more difficult to assess a regular World banknote's value these days. All we have are the cheap options (going through eBay - which only covers about 30-40% of the notes out there- if that) or you have to turn to the expensive greensheet/BNB subscriptions. The SCWPM is quite dated (but at least a starting point) so yeah, & then when it comes to niche of World Notgeld, it is even more challenging.