Superb Debden from 1991 with the First and Last in the Series. The 20X is such a rare note in particular. EPM value is £300 so this is a great offer for a fantastic pair in a leatherette folder…..Brilliant. Few of these Debdens remain now as can be seen from the number of 20X prefixes from Debden sets listed for sale individually in an attempt to increase the value of the note….super pairing.