AN ULTA-rare coin has sold connected eBay for 8000 times its accustomed worth owed to an "extra special" detail.
The 50p fetched a whopping £4,000 - owed to an antithetic mistake successful its design.
Released successful 2011 successful anticipation for the London Olympics, it features a swimmer submerged successful h2o connected its tails side.
However, dissimilar different versions, the swimmer's look is obscured by the ripples successful the water.
Shortly aft the manufacturing process began, the mistake was corrected - meaning determination are lone a fewer 100 successful circulation.
The Royal Mint has antecedently described the uncommon coin arsenic "extra special".
It said: “In the uncommon archetypal design, these lines covered the swimmer’s face.
"Soon aft its release, the coin was tweaked to marque the look much visible, but not earlier the archetypal plan made it retired into the world.
"One of the astir breathtaking aspects of this peculiar 50p is that nary 1 knows precisely however galore entered circulation earlier the changes were made, lone that numbers are highly limited.
"This is often the lawsuit with mistake coins, and they instantly go a collectable piece.
"Few person ever been sold and galore instrumentality pride of spot successful backstage collections, but there’s ever a accidental this invaluable coin could find its mode to you."
The coin attracted a fierce bidding war, with 28 enthusiasts vying for the item.
The Royal Mint's Official London 2012 coin range
It is not the archetypal illustration of its benignant to merchantability for thousands - with different fetching an impressive £1,500 past year.
Kimberly Day, coin adept from RWB, said astatine the time: "Only a fewer 100 examples with this uncommon plan saltation are believed to person been released.
"We're delighted that this coin has raised specified a sum, it's a just terms for specified a uncommon coin and we judge it's worth volition lone summation implicit time."
29 different coins were released for the Games, featuring assorted sports - from gymnastics to tennis to shot to triathlon.
The football version coin is the rarest out of the set, according to The Royal Mint - with conscionable 1,125,500 minted.
Outside the Olympic range, the rarest 50p is the Kew Gardens, of which determination are lone 200,000 retired there.
The Kew Gardens piece was minted a fewer years earlier than the Olympic postulation and has been known to merchantability for up to a whopping £895 on eBay in the past.
How to spot a uncommon coin
A coin is usually classed arsenic uncommon if a constricted magnitude were struck, oregon a manufacturing error occurred erstwhile they were being made.
A debased mintage figure, which is acceptable by The Royal Mint, relates to however galore of a coin were made.
Generally, the little that figure, the much buyers are consenting to wage for it, though this isn't ever the case.
You tin find retired what coins are uncommon and however they look connected The Royal Mint's website.
The Change Checker website has scarcity indices excessively - these archer you however galore of a peculiar coin were minted.
When it comes to mistake coins, however overmuch you'll get for them varies from portion to piece.
What are the astir uncommon and invaluable coins?
For example, the HG Wells £2 mistake coin has been known to merchantability for up to £1,000 successful the past.
Bronze 20p coins person been known to merchantability for up to £750 arsenic good portion mistake £1 coins person been known to spell for up to £200 before.
How to merchantability a uncommon coin
You tin merchantability a uncommon coin connected eBay, Facebook, oregon successful an auction.
If you're selling connected Facebook, determination are risks attached.
Sellers person antecedently been targeted by scammers connected Facebook saying they privation to bargain a uncommon coin and asking for money up beforehand for a courier to prime it up.
But it's a ruse to get wealth retired of you and the courier is ne'er sent.
To debar this happening, it's ever champion to conscionable a Facebook seller in-person erstwhile buying oregon selling anything.
Ensure it's a nationalist gathering spot that's successful a well-lit country and if you can, debar utilizing outgo links.
Most sellers similar to woody with currency straight erstwhile gathering to guarantee it's legitimate.
The safest mode to merchantability a uncommon coin is much than apt astatine auction. You tin organise this with The Royal Mint's Collectors Service.
It has a squad of experts who tin assistance you authenticate and worth your coin.
You tin get successful interaction via email and a subordinate of the valuation squad volition get backmost to you.
You volition beryllium charged for the work though - the outgo varies depending connected the size of your collection.
You tin besides merchantability uncommon coins connected eBay.
But instrumentality into relationship that if you negociate to merchantability your point past eBay volition complaint you 10% of the wealth you made - this includes postage and packaging.
Always carnivore successful caput erstwhile selling immoderate uncommon coin, you volition lone get what