Several limited edition coins which could be worth a lot more than face value have entered or are entering circulation for the first time in 2019.
You may have to hold on to them for a little while to insure their value increases but they are almost guaranteed to be worth more in a few years as the limited number entering circulation makes them rare.
And rare coins are exactly what the thousands of avid money collectors crave.
Here's what to look out for this year.
Sherlock Holmes 50p
A classic Sherlock Holmes silhouette, complete with pipe and deerstalker hat, will appear on a commemorative 50p, marking the 160th birthday of Sir Arthur Conan Doyle.
The image of the world-famous literary detective is surrounded by titles of Sir Arthur's stories, including The Hound of the Baskervilles and The Sign of Four.
Sir Arthur Conan Doyle's creation has inspired generations of adaptations, re-imaginings, tributes and more, reports the Mirror .
The man himself famously only took one first class wicket in a not insignificant cricket career - that of WG Grace. He also played in the same team as Peter Pan creator JM Barrie and Jeeves and Wooster author PG Wodehouse.
D-Day £2 coin
The 75th Anniversary of the D Day landings on June 6 will be marked with a £2 coin. The Allied Invasion of Normandy in 1944 was the largest seaborne invasion in history.
The coin shows the locations of the Normandy landings, naming the beaches picked - Utah, Omaha, Gold, Juno and Sword.
Samuel Pepys £2 coin
Diarist Samuel Pepys - who chronicled the Great Fire of London and plague - will also be honoured with a £2 coin, 350 years after his last entry.
When news of the fire reached him, Pepys famously collected what valuables he could and then - to keep it safe - buried some wine and a Parmesan cheese. The cheese has never been found.
Wedgewood pottery £2 coin
The 260th anniversary of the founding of one of the world's most famous pottery firms will also be celebrated with a Wedgewood pottery £2 coin.
Queen Victoria £5 coin
Queen Victoria, born in May 1819, will be featured on a rare £5 coin, alongside a telephone, a penny-farthing bicycle,and other icons from her six-decade-long reign.
The issue of £5 coins is usually reserved for special royal occasions, with the last one released to mark the Duke and Duchess of Sussex's wedding in May 2018.
