The Two Pound coin you refer to is a 2005 coin commemorating the 400th Anniversary of the Gunpowder Plot by Mr Guy Fawkes and his friends. The edge of the coin has the inscription "REMEMBER THE FIFTH OF NOVEMBER".
What appears to be a backward "7", is actually a stylised "5" if you look very closely.
These coins are still potentially in circulation so, unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they are worth Two Pounds.
There is no documentary evidence of this flaw.
Any coin with a "genuine" minting flaw would have some value, above the usual, as a collectible coin.
Genuinely flawed coins are not necessarily known about or documented until somebody turns up with one, since they are an "accident" of the minting process, and have escaped detection during quality control at the mint therefore, a valuation cannot be anticipated.
A reputable coin dealer should be able to identify and confirm the coin as genuine and make a valuation.
All years of issue of the modern British Two Pound coin are still in circulation so, unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they are worth Two Pounds.
The British Two Pound coin usually features a commemorative design on the reverse.
A Two Pound coin with the date 2007 on it may be -
2006 Two Pound coin commemorating the "Bicentenary of the Abolition of the Slave Trade in the British Empire", with the year 1807 interlinked with a chain on the reverse, with a small 2007 at the bottom.
2007 Two Pound coin commemorating the "Tercentenary of the Act of Union between England and Scotland", with the year 1707 on the reverse.
Yes, it would be, but no 2007 Two Pound coin was issued celebrating the 400th Anniversary of anything.
There is a one pound coin and a two pound coin but not a three pound coin.
There was no British 1901 Two Pound or Double Sovereign coin produced.
Any bank will accept any Two Pound coin, they are legal tender.
Please check your coin. You possibly refer to the 1986 commemorative Two Pound coin.
There was no 1977 British One Pound coin minted. The first general circulation One Pound coins was minted in 1983.
British Pound denominations currently in circulation include - One Pound coin Two Pound coin Five Pound coin (legal tender and often found in circulation) Five Pound note Ten Pound note Twenty Pound note Fifty Pound note
The Pound or Sovereign was not introduced into the British system of currency until 1817 when it replaced the Guinea, and the first Two Pound coin (Double Sovereigns) was minted in 1820.
The One Pound coin replaced the One Pound note in the British currency in 1983. Pound coins include the One Pound and Two Pound coins, and the Five Pound coin which is issued as a commemorative but is still legal tender.
The British 1996 Two Pound coin was the last Two Pound coin to be issued as a non-circulating commemorative. The coin was issued as a "specimen" and a "Proof FDC" coin. In addition to the nickel brass coins, the Proof FDC coins were also issued in silver, piedfort in silver and gold. All "Proof" coins would be issued in some sort of packaging for protection. Any coin issued in a precious metal would need to be certificated to provide a guarantee of authenticity to the purchaser.
There was no 1886 British Two Pound coin minted. During the reign of Queen Victoria, they were only minted in 1887 and 1893.
British general circulation Two Pound coins are made from a nickel-brass alloy. In many years, the Royal Mint also produces a Proof in silver FDC Two Pound coin and occasionally, a Proof piedfort in silver FDC Two Pound coin. These coins are not intended for circulation since their value is much greater than Two Pounds.
I suggest you get a good coin book and search for your coin in there.