According to online collectors, some notes are in great demand and are worth many times their face value.
Hands-On: Ruminations On The New AP Royal Oak Jumbo In Platinum, And Why Nobody Seems To Like It - Hodinkee
Rare £5 notes: which ones are the most valuable?
The rare €5 banknotes that are worth a fortune due to small unique features - Irish Mirror Online
How Much Are Pearls Worth? The Definitive Guide to Value – PEARL-LANG®
Exploring Northern Irish Pound Banknotes: Distinct Currency Designs - Foreign Currency
CNG 117 Virtual Catalog by Classical Numismatic Group, LLC - Issuu
Holy grail of coins' with King Farouk and US Secret Service connection in Sotheby's sale – The Irish Times
How much does a round-the-world trip cost? A full budget analysis!
Rare Euro coins that are worth thousands - check if you have one in your change jar - Irish Mirror Online