Fenntucky Mike

Very good question . The position of the cut through the vertical 'Banco Colombiano' does vary suggesting there was a counterfoil and they were cut as needed. Similar issues in my collection  (e.g. Banco Pamplona) also vary with the position of the cut and it is only remainders/specimens that I have seen which are intact (e.g. Banco Maua & Cia, Banco Internacional) which suggests that the elusive 'cancelled' late S/Ns and/or the Specimens may still have the counterfoil attached. The only notes with EPQ are the 65's and 66's.

Great update - there seems to be alot of modern specimen notes (and proofs/trials etc) around at the moment so it wouldn't surprise me if some dealers/collectors have started to add these. High grade issued notes, particularly already graded examples, seem to be much more difficult to find even for ones that are only a few years old.
It is not just modern notes which are attracting high prices. Stack's Bowers have just had (14th August) a spectacular collection of Latin American notes up for auction including quite a few notes which are unrecorded and/or are the only known example. It just means my 'Impossible Set' is well-named and some people have more money than senseHaving said that quite a few didn't sell as the starting prices were very high,  of the 8 lots that I thought may be possible, 2 went for amazing prices, 2 went for high prices and 4 didn't sell so it will be no surprise that I came away with nothing.
I had asked PMG about BB numbers and they said they are looking into it - they already use specialist catalogue numbers for some countries in addition to Pick numbers so it shouldn't be that difficult to do(?). As you say Pick numbers for new issues is a major problem, not to mention all the errors and incomplete data for earlier issues means that they will probably have to use the Banknote Book at some point, not perfect either but much much better.
Now that your Ukraine collection is very well advanced, and to keep adding things, you just need to include all the former Soviet states, the balkans etc etc
 

Very cool notes, I looked at the auction listing for the 5 chervontsiv and you weren't kidding about uber rare, I wonder how many of those survive when the pmg population is only 3? I have kind of been in the same boat lately, mostly buying notes for other sets or coins and nothing too exciting has come up lately.

Very impressive example -  by far the most 'stamps' I have ever seen!
I wonder how PMG would grade that and do you get bonus points for each stamp
Amazing proof - beautiful image of Gloria Faure, who wasn't even Mexican! If you haven't already seen it, a Coinweek article from 2014:-
https://coinweek.com/mexican-banknotes-two-mexican-women-lady-reputation-beauty-queen
I am still amazed that trying to collect all the Series and dates for these Mexican issues is popular. As you have the front proof for Series CA p34l/M4637Ad you probably have one that most people are not even aware of - it will need a big holder . From the many millions that were printed it looks like I don't even have a single example, I think everyone should have at least a basic denomination set so that is something else to add to the 'to-do-list'
I do have a number of the most recent issues - some of which scan and some don't but then I seem to be missing an example of the 2020 100 pesos note so I have to resort to taking a picture with my phone!

The biggest addition to my very small collection of Mexican notes is this 1950, 5 pesos uniface proof of the face. I always wanted a 5 pesos "gypsy' note, and although they are readily available for little money I wanted something with impact, a story to tell, and I've been dragging my feet for several years on picking up an example. I came across this piece and it was love at first sight, but I held my ground and bartered a little with the seller and got the price down to a level where I just couldn't pass this up. Maybe one day I'll come across a back proof but the face is the more desirable side IMO, I'm not at all disappointed that I don't have a pair and I love this note!

This note was surprisingly difficult to scan and this image is the best I could do so far. For some reason the scan has been creating a "washout" effect, wiping out some of the detail in the note and paper like the plate impressions, alignment marks and annotations.  Needless to say, it is more impressive in person. 

Here is an example of U.S. depression scrip from my collection and why "stickers" came to mind as an option, I don't know if the stamps were, gummed (lick-it-and-stick-it), self-adhesive, or if they were glued on, but this example being issued after 1932 ('33) seems to fall in line with '32 as being a starting point for their use. I would assume they were gummed, similar to a postage stamp, as that technology has been in use prior to 1932.

Very good questions - my first thought was the later French Revolution issues.
For the Mexican Revolution there were certainly contemporary counterfeits, particularly of the larger, more widespread issues. I can't think of any 'propaganda' notes but that doesn't mean there weren't any . Most 'notes' were text based, had portraits of historical or allegorical figures rather than the various leaders of the different factions, or symbols relating to Mexico and/or the State or City where they were produced, all of which, I suppose, would have made 'modification' difficult. As control of territory changed most notes just became worthless or were re-validated by adding a stamp or overprint - there are lots of stamps/overprints and many notes have several. There are a few advertising notes issued by various companies that looked like currency but were not.
I will have to keep a look out now!

Sounds like interesting developments with the Ukraine currency - anyone taking bets on the first Million Hyrven note?
There are lots of Latin American notes of the same period with coupons attached or, as in the Brazilian example below - covering the entire back of the note!
They seem to have been very literal when naming many private banks e.g. the State or City, the major shareholder or the reason for establishing the bank in the first place, as a result I love it that this note was issued by the Coffee Bank

If they are keeping the best notes I'd like to know how I can get an invite or ticket to view the collection! I assume there's a waiting list.  

I have a set of Onchan tokens some where - hadn't even considered notes

Same dealer for the quality and rare Latin American notes that have been appearing recently.
So, and this is completely in the realm of fantasy and guesswork, but for the older notes I guess Canadians have quietly been big collectors of world notes over the years and some long-standing collections are now appearing on the market????  Plus there doesn't seem to be many specialist Canadian auctions and that probably just leaves direct sale to a dealer for many people???
That's what I tell myself, but seeing what the very rare Latin American notes went for at the cgb sale yesterday  I may just have to settle for the good picture (I was hoping to get at least one of the nine but wasn't even remotely close but then the estimates from cgb weren't either  Once graded I wouldn't be surprised to see some of them appear in a Platinum night at Heritage as the only known example)

I love that 20 Sucres note! I like it as much as the Baz un peso and almost as much as the un peso from Durango. It appears I have a type. 

Beautiful note! 
The Lady Lavery notes always seemed over priced and over hyped to me. An interesting story but not a design I would consider overly attractive as a whole. The Durango note blows it away actually. 

Woah! A fantastic note though and I assume a true rarity in that condition. 
It will be interesting to see what that note goes for if it comes back up for auction in the near future. I'm a little surprised that it drew such spirited bidding at Sedwick's, not top of mind when it comes to banknotes for me. I guess it speaks to the strength, popularity and increased demand for Guatemalan notes and the market in general. 
With availability and prices realized for condition rarities I'm more than happy to pick up circulated notes for certain examples, it just doesn't make sense do anything else for most people.

The NBU are just trying to see if you can keep up
I couldn't cope with a moving end date due to new issues, which is probably why the periods my coin and note collections cover have a known start and finish date - the bit in between can be a bit variable though
There does seem to be a lot of 'commemorative' notes in the list but at least you know who the signatures belong to - for the early Latin American notes it wouldn't surprise me if more than half of the signatories remain to be identified, and even then some are just a name only In a moment of madness I even asked ChatGPT - it didn't understand the questions!

Continued from above.
A Pick# 20d, 2 Hryven note with Serial # Г 09704173 (Prefix "Г" is not listed in Krause) XF sold for €3000 Euros ($3338.25 USD).


A Pick# 20s, 2 Hryven specimen also sold for €3000 Euros ($3338.25 USD).


A Pick# 21c, 10 Hryven with serial # B 04015919, the B prefix is rare, sold for €1350 Euros ($1502.21 USD)

Great summary    Rare notes from anywhere in the world seem to be appearing all over the place at the moment - most also seem to be recently graded given the QR code on the back of the holders and, as you have highlighted, are attracting very high prices.
Even though I have no chance of ever owning most of these notes I think the auction appearances are invaluable in confirming that some of them do actually exist  An added bonus is there is now a decent image of the note with legible dates, S/Ns and signatures etc, this does make research a bit easier and, if they are graded, even more so.
 
I like the 'Printer's Design'

Nice pickups! 
I actually have a bid in on a Czech P# 85b right now, it's a lowball bid so I don't expect to win but maybe. 
Good luck on the submission. 

@Fenntucky Mike great notes and grades, nice range of colours too!The Privatisation Certificate is impressive.
This post reminds me that I have enough 'modern' notes to send for grading, as the Pick number often covers a number of different dates/series etc I find the Population Report is, at best, only a rough guide to the rarity of some issues and some notes from the 1960's, 1970's and 1980's are surprisingly difficult to find.
I also have a few, already graded, notes where the designation on the label needs correcting

You give me too much credit I just find it very difficult to write the description of the bank and the note, either finding information or without it turning into an epic and I thought adding ~5 each month should be possible 
I tend to buy what I like the look of at the time and whether I can afford it or not. This all started whilst putting another set together and Venzuela and a few other countries didn't really feature in that at all, and I have to balance 'missing banks' with examples from certain countries and issues that I am doing some more detailed research on. Over the last year or so I have tried adding examples from the earlier banks in Venezuela but there seems to be 2 or 3 collectors very active in this area resulting in extremely strong prices As there are so many other banks to add from across Latin America I expect adding these to Venezuela may have to wait a while.
More moderns may feature in the April additions - but the security features for some of the notes I was going to add means they don't scan

Looks like you've made good progress on the Impossible set in March, although since you've given yourself a big selection of notes to chose from only adding a handful a month actually shows restraint. Something I'm severely lacking in at times, along with funds it seems as there are a lot great notes tempting me at the moment. 
I was looking over the A.I.S. and was wondering why you went with moderns for some of the examples? Venezuela particularly caught my eye. Was this the time period you found most interesting, availability of examples, cost, etc.?

@Fenntucky Mike papermoneyofmexico.com is a fantastic resource for Mexican notes and must have taken many years to assemble the information from collectors, auction houses, banks, printers etc. There are still plenty of gaps though and I have passed on extra S/N ranges, control letters etc and these get added very quickly which is great - which reminds me I have some more to send. If any one has extra info let Simon know, he has done a fantastic job.
However, the information for almost all the other countries in Latin America does seem to be less readily available, and may not actually be recorded anywhere, and that's for the post World War II main issues! The earlier issues, and those from the smaller private banks are even more of a challenge and the 'Impossible Set' was just my way of trying to start organising things - now I need a website. I am mainly gathering information for three of the countries at the moment and I wish they kept records as well as Ukraine as some central banks do not seem to know who signed some of their own modern banknotes

That's interesting! It looks like it bleed through to the back of the note and that appears red as well.  My opinion would be that red ink was used, especially if you can tie it to a series and number range. Good luck in researching this, hopefully there will be a definitive answer for you at the end of this crumb trail. 

@Fenntucky Mike well spotted, the signature is Julio Calvo authorising the bill for the Government as it was a private bank. One of the reasons I picked this note was that the signature was in red as the only info I have is that the signatures were stamped, and in black or blue. All the other examples I have seen match this so it may just be Series EE. It looks red to me but as you will appreciate this may be another case of it being the only colour available at the time or changes over the long-term? 
Even though there seems to be plenty of gaps in the records for major issues these smaller banks are going to take a lot of research 

Is this one hand signed or stamped/printed, the sig in red? Looks stamped but it would be one heck of a sig if not. Was there a changing of the guard that required the additional signature or is it just graffiti? An original Banksy perhaps?