RARE coins can often sell for hundreds of pounds if they’re spotted by the right person.
Experts have listed those that are the hardest to get hold of, but also pretty valuable and could make a major mint.
There are dozens of different 50p designs out there, but not all of them are valuable to collectors.
It’s usually the coins with low mintage figures, of which there are fewer, that are the most valuable due to their rarity.
Change Checker updates it scarcity index, which looks at these figures and ranks coins, every three months – and with the last having taken place in May, we’re due a fresh look very soon.