According to online collectors, some notes are in great demand and are worth many times their face value.
Euro note collectors: The Fascinating World of Euro Banknote Collecting - FasterCapital
RARE 50 EURO BANKNOTES. FOUND RARE NUMBERS!Counting Stack of 50 EURO
The rare €5 banknotes that are worth a fortune due to small unique features - Irish Mirror Online
I recently got one of those old 5€ bills from a store, haven't seen one in years and almost forgot what they looked like. : r/europe
Euro note collectors: The Fascinating World of Euro Banknote Collecting - FasterCapital
Rare Bank Notes - Ireland
The world's most valuable rare notes
Rare Banknotes - Ireland
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Rare Euro coins that are worth thousands - check if you have one in your change jar - Irish Mirror Online
Bank of Ireland £5 and £10 Banknotes with matching serial numbers (2017) - UNC.
Euro note collector's edition: Exploring Rare and Valuable Euro Banknotes - FasterCapital
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Euro note collectors: The Fascinating World of Euro Banknote Collecting - FasterCapital