The year of minting is not indicated on any coin, only the year of issue, which may be the same.
The year of issue of the British One Pound coin is on the "heads" side.
Coins issued for 2012 were very possibly minted in 2011, but could just have easily been minted in 2012 depending on requirements and demand for quantities of the coin in circulation.
There were no 1990 British Two Pound coins minted.
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
There is a one pound coin and a two pound coin but not a three pound coin.
The British One Pound coin is round.
Such a coin does not exist. The British One Pound coin was first issued in 1983.
There was no 1811 British Sovereign or One Pound coin minted.
There was no 1977 British One Pound coin minted. The first general circulation One Pound coins was minted in 1983.
There was no British 1901 Two Pound or Double Sovereign coin produced.
There has been a British Five Pound coin on and off since 1817. The British decimal Five Pound gold bullion coin was first issued in 1980 and the Five Pound "Crown" coin was first issued in 1990. The current British Five Pound "Crown" coin is intended to be a non-circulating legal tender commemorative coin. The Royal Mint has no current plans to produce a general circulation Five Pound coin in the foreseeable future.
The 1983 One Pound coin was the year of first issue for the British One Pound coin which replaced the One Pound note. The British One Pound coin is legal tender anywhere in the United Kingdom and some of its dependencies.
The British decimal One Pound (nickel brass) coin was first issued in 1983. A gold One Pound coin was issued from about 1489 until 1604.
I can find no documented evidence of a 2010 British Two Pound coin "double die". 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.