What is the rarest banknote?

Answer 1

In some way, every banknote is rare because since the introduction of serial numbers, each one is unique. A 1919 Canadian $5 note was sold at auction in 2010 for $21,000 simply because it had the serial number '000001'. A 1929 Palestinian £50 with the serial number A000000 was sold in the same auction for $115,000.

Most banks produce un-issued sample or test notes, of which surviving examples are very rare.

A banknote museum in Munich, Germany claims to have the world's rarest banknote on display; The only known 1914 New Guinea 100 Mark note from the time when it was a German colony.

Answer 2

No way to answer without knowing what the bank notes are, and their condition.

Answer 3

The Penny Magenta British Guiana.