This set contains five 50 pence coins carrying the reverse designs of commemorative 50 pence issued in earlier years and having topics related to British culture; all coins in the set are dated 2019, and are gold piedforts (double the thickness and weight of the gold proofs).
The Royal Mint says:
"Released in 1969 as the country geared up for the decimal switchover, the 50p was nothing short of revolutionary. But this was no heptagonal novelty. The world’s first seven-sided coin was designed to roll smoothly in vending machines and after a rocky start, it won over the British public. During half a century in circulation, the 50p has been issued in a range of commemorative editions, celebrating every aspect of British culture. Signature designs and limited mintages have made them highly collectable.
As the 50p turns 50, The Royal Mint is delighted to present a carefully curated set of coins celebrating Britain’s cultural legacy - a fitting way to mark this milestone moment. Coins celebrating the first sub-four-minute mile, the Scouting movement, the Girl Guides and Kew Gardens and presented alongside Christopher Ironside’s classic Britannia - testament to the legacy of institutions and achievements that continue to inspire us today. Each coin in this set is year-dated 2019, struck in 22 carat gold and finished to Proof standard." | 
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