We can say that it is very common to see lots of 20-franc Debussy Type 1989 notes for sale on the auction websites. But there, it is a set of three copies of the Alphabet "A.26" (Ref. Fayette-Dessal: # F.66.10A26 or Pick: # 151) and whose numbers are consecutive: 758592, 758593 and 758594. The notes seem in perfect grade (in our opinion: aUNC grade with slight fold of bundle visible on the photos below).
Is the alphabet "A.26" so rare?
This banknote quoted € 450 in AU grade and € 700 in UNC grade (1) is currently known to 106 copies in the inventory of Kajacques numismatique. Jacques Dutang also indicates in red in his table all the most recent pointed notes. You would think that the score seems to have skyrocketed since August 2019, because no less than 24 new copies have appeared. These banknotes constitute a list of numbers ranging from 758570 to 758658 ... and which our three notes are added!
So, would we have been hiding a recent find from us? And of what importance?
Let's go back to the sale. The seller offering a lot probably does not know the unit value of each of these three notes. Besides, no mention of rarity is indicated in the description. In any case, it will be interesting to observe the final price of this sale, if only it ends, i.e. in 4 days ...
(1) "La cote des billets", 2019 edition by MM. Claude Fayette and Jean-Marc Dessal (cf. pages 345-347). French/English texts.