Bank Note Museum has, for some time now, been creating catalogue numbers for new notes following on from the Pick numbers. It uses the style P#W. I've just had a request to add such a number to a note. I rejected it as I don't think these P#W numbers are “official” in the sense that no one else uses them. However, just to be sure, I thought I'd ask if anyone is aware of the use of these numbers elsewhere. If they are, perhaps we need to create a new type of catalogue number to accomodate them?

