because there were 83 million cents minted in 1923 but only 7 million in 1922. In addition, a few of the cents minted in 1922 are missing the mintmark. This is one of the most popular error coins in existence - scarce enough that you are unlikely to ever own one yet common enough that you can always hope to.
I would imagine that it was worth 500 marks!
No.
What's It Worth - 1948 was released on: USA: 21 May 1948
A 1948 farthing, which was a British coin worth one-quarter of a penny, would be worth only a small fraction of a penny today, as it was discontinued in 1960 and is no longer in circulation. In terms of purchasing power, its value would be significantly diminished due to inflation. Adjusting for inflation, its equivalent value in today's money would be less than a penny, making it largely a collector's item rather than a functional currency.
Modified coins have no collector value. Any value would be associated with the ring as a piece of jewellery. The 1948 British Florin is made from a copper-nickel alloy and, in perfect condition (not as part of a ring), it might get up to £8 GBP.
British Eagle was created in 1948.
British Ceylon ended in 1948.
British Rail was created in 1948.
1948
A 1948-D what?
1948 Jefferson nickels are still in circulation, it would have to be a high grade Mint State coin to be worth 25 cents.
A New Zealand 1948 cupro-nickel Sixpence (George VI), uncirculated and in absolute mint condition could fetch up to $160 NZD. If it has been circulated but still in good condition, it might fetch anything from $2 to $50 NZD. There were 2 million minted. A reputable coin dealer will be able to give a more accurate valuation.