This is one of the rarest Debden Sets. The reason is that so many have been broken up to sell the notes separately in order to maximise sale prices. The reality is that at nearly every banknote auction over the past ten years, set(s) of the note notes appear with no casing, or the notes are sold in single Lots. I think out of the original 1000 Sets produced, only a few hundred, if that, remain intact and entire. This is a superb collection of notes in the original folders with a serial number of 001138 for each note with the separate prefix. It is outstanding. Very rare indeed as thus.