There is no documented evidence of a minting flaw in the "Festival of Britain" Crown, but it is possible. A reputable coin dealer will be able to advise.
Yes, a Festival of Britain coin still in its original box typically fetches a higher price among collectors. The condition and packaging significantly influence the coin's value, as collectors often prefer items that are well-preserved and complete with their original packaging. Coins that are uncirculated and accompanied by their boxes can command a premium over those that are not.
There was no "Festival of Britain" Florin minted, you possibly refer to the "Festival of Britain" Crown (Five Shillings). See "What is the value of a 1951 British Crown - Festival of Britain".
The value of the Festival of Britain coin set in a blue box can vary based on its condition and market demand, but it generally ranges from £20 to £50. Specific editions or sets in excellent condition may fetch higher prices among collectors. To get an accurate estimate, it’s advisable to check recent sales on auction sites or consult a coin dealer.
Do you mean the Festival of Britain in 1951?
in britten Britain in 1951.
1951
It depends on the date, denomination and what you call a mistake, post new question.
The Festival of Britain was a national exhibition which opened in London and around Britain in May 1951. The official opening was on May 3.
To determine the proof of a 1951 British Crown - Festival of Britain coin, you can inspect its surface for signs of minting quality. Proof coins typically have a mirror-like finish with sharp, detailed designs and no signs of wear. Additionally, you can check the coin's specifications; the proof version usually has a different mintage and is often made of a higher quality metal compared to circulation coins. Consulting a reputable coin catalog or a numismatic expert can also help confirm its proof status.
1951
1951
15 years is a very big mistake especially for a gold coin. I suggest that the coin is not what it appears to be. A reputable coin dealer will be able to identify your coin and give a valuation if it turns out to be genuine.