In 1973 the Royal Mint issued its first-ever commemorative 50 Pence, in fact, it is the only large-sized 50p that is a commemorative coin. It was issued when the UK joined the European Community, good for some bad for others, but still the first and only large-sized 50p commemorative.
It was issued in Proof cupronickel only, not silver, not gold, just the same metal as the regular
circulating coins. Gosh in those days the Royal Mint wasn't trying to sell every metal in the world.
We can offer this commemorative 50p from 1973 in Proof condition. They are now over 47 years old.