How tiny smudge on back of your £20 note could net you huge profit – check your change now

A TINY smudge on the back of your £20 note could net you a huge profit.

A £20 note has been listed at auction with an estimated value of £75.

Invaluable.comThe note features an unusual smudge mark[/caption] Invaluable.comThe note could be worth up to £75[/caption] Getty - ContributorA regular £20 notes[/caption]

The reason for the inflated value is a smudge which passed through the serial number.

The note was listed for auction on June 3 this year by London Coins.