No, not any longer.
The last British Coins minted in coin rotation were the Victorian silver coins of 1887. Notably, the 1887 Halfcrown, Florin, Shilling, Sixpence, Threepence and the Maundy coins.
Prior to that, British coins were first regularly struck in rotation from about 1660.
Referring only to British coins, "coin rotation" or "die axis" is the striking of a coin so that the obverse and reverse are 180 degrees out of alignment.
This was once a good way to determine if the coin was genuine since forgers rarely bothered with coin rotation, or only got it partly right, rotating the coin at something other than 180 degrees. These days, forgers are a little more careful.
No, they are not rare. British coins were minted that way for hundreds of years. The process is called "Coin Rotation" or "Die Axis". British coins were minted with a 180 degree rotation, so that reverse is 180 degrees out of alignment with the obverse. The practice was gradually discontinued during the course of the 19th century. By 1887, all coins were minted without "coin rotation". Many other countries used "coin rotation" on their coins and not always at 180 degees.
There was no 1977 British One Pound coin minted. The first general circulation One Pound coins was minted in 1983.
There were no British 1998 10 Pence coins minted for circulation. There were some minted for Proof and Mint uncirculated coin sets.
There were 10,191,000 60th Anniversary of the end of World War 2 British Two Pound coins minted. There were 5,140,500 400th Anniversary of the Gunpowder Plot British Two Pound coins minted.
There were no 1740 British Crown coins minted. The Crown coin was not regularly minted during the reign of King George II.
There were no British Two Pound coins minted from 1888 to 1892 inclusive.
Yes. It was the practice for hundreds of years for the reverse and obverse of British coins to be 180 degrees out. The practice was gradually phased out during the course of the 19th century.
Therre were no 1821 British Double Sovereign or Two Pound coins minted.
Whatever British coins were being minted in 1916, were still being minted in 1918. The Half-Sovereign coin was not minted in 1917, but resumed minting in 1918. The Half-Sovereign was only periodically minted during the 20th century predecimal period, and was not minted at all from 1927 to 1936 and 1938 to 1979 inclusive. The British Third-Farthing coin ceased to be minted in 1913, although it was only minted specifically for Malta.
For coins minted in British India (pre-1947), the Bombay minted used a dot. For coins minted in independent India, (post-1947), the Bombay mint uses a small diamond (although proof coins from 1969 to 1995 used a "B").
Such a coin does not exist. The only British Half-Sovereign coins minted in 1923 were minted at the Pretoria Mint in South Africa and were all Proof coins.
The Royal Mint produced no Half-Farthing coins after 1856.