Maybe you shouldn't get rid of your old fivers just yet

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The new plastic £5 notes are pretty exciting - out with the old and in with the new and all that.

However, maybe you shouldn't be in such a rush to get rid of your old fivers just yet, because they could be worth a whole lot more in the future.

According to thesaleroom.com, an old fiver could be worth as much as 140 times more in years to come. How have they come to this conclusion? Well, judging from the past, that's how.

1979 five pound note.
A £5 note from 1979 (Spink & Son)

Bank notes from 30 years ago are worth so much more now than they were back in the day, with a Bank of England £5 note dating from 1979 set to sell at auction for an estimated price of £7,000.

This is just one of the many fivers that will go for auction at thesaleroom.com on Tuesday October 4 from between an estimated £2,000 to £7,000. There's even one dating back as far as 1814.

1814 five pound note.
A £5 note from 1814 (Spink & Son)

Even if you don't have any particularly historic fivers knocking about, you could still make between £100 and £150 for one from 1990. Better than a kick in the teeth.

It's not just your old fivers that you should keep hold of. According to eBay you can also make a tidy profit from one of the new £5 notes. If you've got one of the first batch of notes with serial numbers starting with AA01, you could have your hands on a collector's item and make around £200.

New £5 note.
(Dominic Lipinski/PA)

Who knew fivers could be worth so much more than face value?